diff --git a/tests/core/pyspec/eth2spec/gen_helpers/gen_from_tests/gen.py b/tests/core/pyspec/eth2spec/gen_helpers/gen_from_tests/gen.py
index 88bc6d601..65a9fe46d 100644
--- a/tests/core/pyspec/eth2spec/gen_helpers/gen_from_tests/gen.py
+++ b/tests/core/pyspec/eth2spec/gen_helpers/gen_from_tests/gen.py
@@ -109,3 +109,24 @@ def run_state_test_generators(runner_name: str,
                     preset_name=preset_name,
                     all_mods=all_mods,
                 ))
+
+
+def combine_mods(dict_1, dict_2):
+    """
+    Return the merged dicts, where the result value would be a list of the values from two dicts.
+    """
+    # The duplicate dict_1 items would be ignored here.
+    dict_3 = {**dict_1, **dict_2}
+
+    intersection = list(dict_1.keys() & dict_2.keys())
+    for key in intersection:
+        # To list
+        if not isinstance(dict_3[key], List):
+            dict_3[key] = [dict_3[key], ]
+        # Append dict_1 value to list
+        if isinstance(dict_1[key], List):
+            dict_3[key] += dict_1[key]
+        else:
+            dict_3[key].append(dict_1[key])
+
+    return dict_3
diff --git a/tests/core/pyspec/eth2spec/test/merge/sanity/test_blocks.py b/tests/core/pyspec/eth2spec/test/merge/sanity/test_blocks.py
index 4a6db4106..09cb547c2 100644
--- a/tests/core/pyspec/eth2spec/test/merge/sanity/test_blocks.py
+++ b/tests/core/pyspec/eth2spec/test/merge/sanity/test_blocks.py
@@ -11,7 +11,7 @@ from eth2spec.test.context import (
 
 @with_merge_and_later
 @spec_state_test
-def test_empty_block_transition(spec, state):
+def test_empty_block_transition_no_tx(spec, state):
     yield 'pre', state
 
     block = build_empty_block_for_next_slot(spec, state)
diff --git a/tests/generators/genesis/main.py b/tests/generators/genesis/main.py
index a595db612..331381aa7 100644
--- a/tests/generators/genesis/main.py
+++ b/tests/generators/genesis/main.py
@@ -1,4 +1,4 @@
-from eth2spec.gen_helpers.gen_from_tests.gen import run_state_test_generators
+from eth2spec.gen_helpers.gen_from_tests.gen import run_state_test_generators, combine_mods
 from eth2spec.test.helpers.constants import PHASE0, ALTAIR, MERGE
 
 
@@ -7,14 +7,15 @@ if __name__ == "__main__":
         'initialization',
         'validity',
     ]}
-    altair_mods = phase_0_mods
+
     # we have new unconditional lines in `initialize_beacon_state_from_eth1` and we want to test it
-    merge_mods = {
-        **{key: 'eth2spec.test.merge.genesis.test_' + key for key in [
-            'initialization',
-        ]},
-        **altair_mods,
-    }
+    altair_mods = phase_0_mods
+
+    _new_merge_mods = {key: 'eth2spec.test.merge.genesis.test_' + key for key in [
+        'initialization',
+    ]}
+    merge_mods = combine_mods(_new_merge_mods, altair_mods)
+
     all_mods = {
         PHASE0: phase_0_mods,
         ALTAIR: altair_mods,
diff --git a/tests/generators/sanity/main.py b/tests/generators/sanity/main.py
index f5a6ccb41..705456824 100644
--- a/tests/generators/sanity/main.py
+++ b/tests/generators/sanity/main.py
@@ -1,5 +1,5 @@
 from eth2spec.test.helpers.constants import PHASE0, ALTAIR, MERGE
-from eth2spec.gen_helpers.gen_from_tests.gen import run_state_test_generators
+from eth2spec.gen_helpers.gen_from_tests.gen import run_state_test_generators, combine_mods
 
 
 if __name__ == "__main__":
@@ -7,12 +7,16 @@ if __name__ == "__main__":
         'blocks',
         'slots',
     ]}
-    altair_mods = {**{key: 'eth2spec.test.altair.sanity.test_' + key for key in [
+
+    _new_altair_mods = {key: 'eth2spec.test.altair.sanity.test_' + key for key in [
         'blocks',
-    ]}, **phase_0_mods}
-    merge_mods = {**{key: 'eth2spec.test.merge.sanity.test_' + key for key in [
+    ]}
+    altair_mods = combine_mods(_new_altair_mods, phase_0_mods)
+
+    _new_merge_mods = {key: 'eth2spec.test.merge.sanity.test_' + key for key in [
         'blocks',
-    ]}, **altair_mods}
+    ]}
+    merge_mods = combine_mods(_new_merge_mods, altair_mods)
 
     all_mods = {
         PHASE0: phase_0_mods,