diff --git a/tests/core/pyspec/eth2spec/test/altair/random/test_random.py b/tests/core/pyspec/eth2spec/test/altair/random/test_random.py
index d00da3f9e..2250101bd 100644
--- a/tests/core/pyspec/eth2spec/test/altair/random/test_random.py
+++ b/tests/core/pyspec/eth2spec/test/altair/random/test_random.py
@@ -36,11 +36,11 @@ def test_randomized_0(spec, state):
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:0,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
     # epochs:1,slots:0,with-block:no_block
     # epochs:0,slots:random_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
-    scenario = {'transitions': [{'validation': 'validate_is_not_leaking', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 0, 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'random_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
+    scenario = {'transitions': [{'validation': 'validate_is_not_leaking', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 0, 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'random_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
     yield from run_generated_randomized_test(
         spec,
         state,
@@ -62,11 +62,11 @@ def test_randomized_1(spec, state):
     # epochs:0,slots:0,with-block:no_block
     # epochs:1,slots:0,with-block:no_block
     # epochs:0,slots:random_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:0,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
-    scenario = {'transitions': [{'validation': 'validate_is_not_leaking', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'random_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 0, 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
+    scenario = {'transitions': [{'validation': 'validate_is_not_leaking', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'random_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 0, 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
     yield from run_generated_randomized_test(
         spec,
         state,
@@ -88,11 +88,11 @@ def test_randomized_2(spec, state):
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:penultimate_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:last_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
-    scenario = {'transitions': [{'validation': 'validate_is_not_leaking', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'penultimate_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'last_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
+    scenario = {'transitions': [{'validation': 'validate_is_not_leaking', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'penultimate_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'last_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
     yield from run_generated_randomized_test(
         spec,
         state,
@@ -114,11 +114,11 @@ def test_randomized_3(spec, state):
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:last_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
     # epochs:1,slots:0,with-block:no_block
     # epochs:0,slots:last_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
-    scenario = {'transitions': [{'validation': 'validate_is_not_leaking', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'last_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'last_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
+    scenario = {'transitions': [{'validation': 'validate_is_not_leaking', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'last_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'last_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
     yield from run_generated_randomized_test(
         spec,
         state,
@@ -140,11 +140,11 @@ def test_randomized_4(spec, state):
     # epochs:0,slots:0,with-block:no_block
     # epochs:1,slots:0,with-block:no_block
     # epochs:0,slots:last_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
     # epochs:1,slots:0,with-block:no_block
     # epochs:0,slots:penultimate_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
-    scenario = {'transitions': [{'validation': 'validate_is_not_leaking', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'last_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'penultimate_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
+    scenario = {'transitions': [{'validation': 'validate_is_not_leaking', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'last_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'penultimate_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
     yield from run_generated_randomized_test(
         spec,
         state,
@@ -166,11 +166,11 @@ def test_randomized_5(spec, state):
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:random_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:random_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
-    scenario = {'transitions': [{'validation': 'validate_is_not_leaking', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'random_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'random_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
+    scenario = {'transitions': [{'validation': 'validate_is_not_leaking', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'random_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'random_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
     yield from run_generated_randomized_test(
         spec,
         state,
@@ -192,11 +192,11 @@ def test_randomized_6(spec, state):
     # epochs:0,slots:0,with-block:no_block
     # epochs:1,slots:0,with-block:no_block
     # epochs:0,slots:penultimate_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:penultimate_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
-    scenario = {'transitions': [{'validation': 'validate_is_not_leaking', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'penultimate_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'penultimate_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
+    scenario = {'transitions': [{'validation': 'validate_is_not_leaking', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'penultimate_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'penultimate_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
     yield from run_generated_randomized_test(
         spec,
         state,
@@ -218,11 +218,11 @@ def test_randomized_7(spec, state):
     # epochs:0,slots:0,with-block:no_block
     # epochs:1,slots:0,with-block:no_block
     # epochs:0,slots:0,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
     # epochs:1,slots:0,with-block:no_block
     # epochs:0,slots:0,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
-    scenario = {'transitions': [{'validation': 'validate_is_not_leaking', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 0, 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 0, 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
+    scenario = {'transitions': [{'validation': 'validate_is_not_leaking', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 0, 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 0, 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
     yield from run_generated_randomized_test(
         spec,
         state,
@@ -244,11 +244,11 @@ def test_randomized_8(spec, state):
     # epochs:epochs_until_leak,slots:0,with-block:no_block
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:0,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
     # epochs:1,slots:0,with-block:no_block
     # epochs:0,slots:random_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
-    scenario = {'transitions': [{'epochs_to_skip': 'epochs_until_leak', 'validation': 'validate_is_leaking', 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 0, 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'random_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
+    scenario = {'transitions': [{'epochs_to_skip': 'epochs_until_leak', 'validation': 'validate_is_leaking', 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 0, 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'random_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
     yield from run_generated_randomized_test(
         spec,
         state,
@@ -270,11 +270,11 @@ def test_randomized_9(spec, state):
     # epochs:epochs_until_leak,slots:0,with-block:no_block
     # epochs:1,slots:0,with-block:no_block
     # epochs:0,slots:random_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:0,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
-    scenario = {'transitions': [{'epochs_to_skip': 'epochs_until_leak', 'validation': 'validate_is_leaking', 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'random_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 0, 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
+    scenario = {'transitions': [{'epochs_to_skip': 'epochs_until_leak', 'validation': 'validate_is_leaking', 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'random_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 0, 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
     yield from run_generated_randomized_test(
         spec,
         state,
@@ -296,11 +296,11 @@ def test_randomized_10(spec, state):
     # epochs:epochs_until_leak,slots:0,with-block:no_block
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:penultimate_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:last_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
-    scenario = {'transitions': [{'epochs_to_skip': 'epochs_until_leak', 'validation': 'validate_is_leaking', 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'penultimate_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'last_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
+    scenario = {'transitions': [{'epochs_to_skip': 'epochs_until_leak', 'validation': 'validate_is_leaking', 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'penultimate_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'last_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
     yield from run_generated_randomized_test(
         spec,
         state,
@@ -322,11 +322,11 @@ def test_randomized_11(spec, state):
     # epochs:epochs_until_leak,slots:0,with-block:no_block
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:last_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
     # epochs:1,slots:0,with-block:no_block
     # epochs:0,slots:last_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
-    scenario = {'transitions': [{'epochs_to_skip': 'epochs_until_leak', 'validation': 'validate_is_leaking', 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'last_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'last_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
+    scenario = {'transitions': [{'epochs_to_skip': 'epochs_until_leak', 'validation': 'validate_is_leaking', 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'last_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'last_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
     yield from run_generated_randomized_test(
         spec,
         state,
@@ -348,11 +348,11 @@ def test_randomized_12(spec, state):
     # epochs:epochs_until_leak,slots:0,with-block:no_block
     # epochs:1,slots:0,with-block:no_block
     # epochs:0,slots:last_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
     # epochs:1,slots:0,with-block:no_block
     # epochs:0,slots:penultimate_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
-    scenario = {'transitions': [{'epochs_to_skip': 'epochs_until_leak', 'validation': 'validate_is_leaking', 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'last_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'penultimate_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
+    scenario = {'transitions': [{'epochs_to_skip': 'epochs_until_leak', 'validation': 'validate_is_leaking', 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'last_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'penultimate_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
     yield from run_generated_randomized_test(
         spec,
         state,
@@ -374,11 +374,11 @@ def test_randomized_13(spec, state):
     # epochs:epochs_until_leak,slots:0,with-block:no_block
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:random_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:random_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
-    scenario = {'transitions': [{'epochs_to_skip': 'epochs_until_leak', 'validation': 'validate_is_leaking', 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'random_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'random_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
+    scenario = {'transitions': [{'epochs_to_skip': 'epochs_until_leak', 'validation': 'validate_is_leaking', 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'random_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'random_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
     yield from run_generated_randomized_test(
         spec,
         state,
@@ -400,11 +400,11 @@ def test_randomized_14(spec, state):
     # epochs:epochs_until_leak,slots:0,with-block:no_block
     # epochs:1,slots:0,with-block:no_block
     # epochs:0,slots:penultimate_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
     # epochs:0,slots:0,with-block:no_block
     # epochs:0,slots:penultimate_slot_in_epoch,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
-    scenario = {'transitions': [{'epochs_to_skip': 'epochs_until_leak', 'validation': 'validate_is_leaking', 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'penultimate_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'penultimate_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
+    scenario = {'transitions': [{'epochs_to_skip': 'epochs_until_leak', 'validation': 'validate_is_leaking', 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'penultimate_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 0, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 'penultimate_slot_in_epoch', 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
     yield from run_generated_randomized_test(
         spec,
         state,
@@ -426,11 +426,11 @@ def test_randomized_15(spec, state):
     # epochs:epochs_until_leak,slots:0,with-block:no_block
     # epochs:1,slots:0,with-block:no_block
     # epochs:0,slots:0,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
     # epochs:1,slots:0,with-block:no_block
     # epochs:0,slots:0,with-block:no_block
-    # epochs:0,slots:0,with-block:random_block_altair
-    scenario = {'transitions': [{'epochs_to_skip': 'epochs_until_leak', 'validation': 'validate_is_leaking', 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 0, 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 0, 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
+    # epochs:0,slots:0,with-block:random_block_altair_with_cycling_sync_committee_participation
+    scenario = {'transitions': [{'epochs_to_skip': 'epochs_until_leak', 'validation': 'validate_is_leaking', 'slots_to_skip': 0, 'block_producer': 'no_block'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 0, 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}, {'epochs_to_skip': 1, 'slots_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'slots_to_skip': 0, 'epochs_to_skip': 0, 'block_producer': 'no_block', 'validation': 'no_op_validation'}, {'block_producer': 'random_block_altair_with_cycling_sync_committee_participation', 'epochs_to_skip': 0, 'slots_to_skip': 0, 'validation': 'no_op_validation'}], 'state_randomizer': 'randomize_state_altair'}  # noqa: E501
     yield from run_generated_randomized_test(
         spec,
         state,
diff --git a/tests/core/pyspec/eth2spec/test/utils/randomized_block_tests.py b/tests/core/pyspec/eth2spec/test/utils/randomized_block_tests.py
index 338f88b6a..44dab0e0e 100644
--- a/tests/core/pyspec/eth2spec/test/utils/randomized_block_tests.py
+++ b/tests/core/pyspec/eth2spec/test/utils/randomized_block_tests.py
@@ -128,9 +128,12 @@ def random_block(spec, state, _signed_blocks):
 SYNC_AGGREGATE_PARTICIPATION_BUCKETS = 4
 
 
-def random_block_altair(spec, state, signed_blocks):
+def random_block_altair_with_cycling_sync_committee_participation(spec,
+                                                                  state,
+                                                                  signed_blocks):
     block = random_block(spec, state, signed_blocks)
-    fraction_missed = len(signed_blocks) / SYNC_AGGREGATE_PARTICIPATION_BUCKETS
+    block_index = len(signed_blocks) % SYNC_AGGREGATE_PARTICIPATION_BUCKETS
+    fraction_missed = block_index * (1 / SYNC_AGGREGATE_PARTICIPATION_BUCKETS)
     fraction_participated = 1.0 - fraction_missed
     block.body.sync_aggregate = get_random_sync_aggregate(
         spec,
diff --git a/tests/generators/random/generate.py b/tests/generators/random/generate.py
index 7f033f957..099be5f35 100644
--- a/tests/generators/random/generate.py
+++ b/tests/generators/random/generate.py
@@ -20,7 +20,7 @@ from eth2spec.test.utils.randomized_block_tests import (
     randomize_state,
     randomize_state_altair,
     random_block,
-    random_block_altair,
+    random_block_altair_with_cycling_sync_committee_participation,
     last_slot_in_epoch,
     random_slot_in_epoch,
     penultimate_slot_in_epoch,
@@ -252,7 +252,7 @@ if __name__ == "__main__":
         run_generate_tests_to_std_out(
             ALTAIR,
             state_randomizer=randomize_state_altair,
-            block_randomizer=random_block_altair,
+            block_randomizer=random_block_altair_with_cycling_sync_committee_participation,
         )
     if not did_generate:
         warnings.warn("no phase given for test generation")