diff --git a/tests/core/pyspec/eth2spec/test/deneb/fork_choice/test_on_block.py b/tests/core/pyspec/eth2spec/test/deneb/fork_choice/test_on_block.py
index e1dc536c6..12451f4ca 100644
--- a/tests/core/pyspec/eth2spec/test/deneb/fork_choice/test_on_block.py
+++ b/tests/core/pyspec/eth2spec/test/deneb/fork_choice/test_on_block.py
@@ -8,18 +8,20 @@ from eth2spec.test.context import (
 from eth2spec.test.helpers.block import (
     build_empty_block_for_next_slot,
 )
+from eth2spec.test.helpers.execution_payload import (
+    compute_el_block_hash,
+)
 from eth2spec.test.helpers.fork_choice import (
     BlobData,
     get_genesis_forkchoice_store_and_block,
     on_tick_and_append_step,
-    tick_and_add_block,
-    with_blob_data,
+    tick_and_add_block_with_data,
 )
 from eth2spec.test.helpers.state import (
     state_transition_and_sign_block,
 )
 from eth2spec.test.helpers.sharding import (
-    get_sample_opaque_tx
+    get_sample_opaque_tx,
 )
 
 
@@ -27,7 +29,7 @@ def get_block_with_blob(spec, state, rng=None):
     block = build_empty_block_for_next_slot(spec, state)
     opaque_tx, blobs, blob_kzg_commitments, blob_kzg_proofs = get_sample_opaque_tx(spec, blob_count=1, rng=rng)
     block.body.execution_payload.transactions = [opaque_tx]
-    # block.body.execution_payload.block_hash = compute_el_block_hash(spec, block.body.execution_payload)
+    block.body.execution_payload.block_hash = compute_el_block_hash(spec, block.body.execution_payload)
     block.body.blob_kzg_commitments = blob_kzg_commitments
     return block, blobs, blob_kzg_proofs
 
@@ -51,10 +53,7 @@ def test_simple_blob_data(spec, state):
     signed_block = state_transition_and_sign_block(spec, state, block)
     blob_data = BlobData(blobs, blob_kzg_proofs)
 
-    def run_func_1():
-        yield from tick_and_add_block(spec, store, signed_block, test_steps, blob_data=blob_data)
-
-    yield from with_blob_data(spec, blob_data, run_func_1)
+    yield from tick_and_add_block_with_data(spec, store, signed_block, test_steps, blob_data)
 
     assert spec.get_head(store) == signed_block.message.hash_tree_root()
 
@@ -64,10 +63,7 @@ def test_simple_blob_data(spec, state):
     signed_block = state_transition_and_sign_block(spec, state, block)
     blob_data = BlobData(blobs, blob_kzg_proofs)
 
-    def run_func_2():
-        yield from tick_and_add_block(spec, store, signed_block, test_steps, blob_data=blob_data)
-
-    yield from with_blob_data(spec, blob_data, run_func_2)
+    yield from tick_and_add_block_with_data(spec, store, signed_block, test_steps, blob_data)
 
     assert spec.get_head(store) == signed_block.message.hash_tree_root()
 
@@ -95,10 +91,7 @@ def test_invalid_incorrect_proof(spec, state):
     blob_kzg_proofs = [b'\xc0' + b'\x00' * 47]
     blob_data = BlobData(blobs, blob_kzg_proofs)
 
-    def run_func_1():
-        yield from tick_and_add_block(spec, store, signed_block, test_steps, blob_data=blob_data, valid=False)
-
-    yield from with_blob_data(spec, blob_data, run_func_1)
+    yield from tick_and_add_block_with_data(spec, store, signed_block, test_steps, blob_data, valid=False)
 
     assert spec.get_head(store) != signed_block.message.hash_tree_root()
 
@@ -126,10 +119,63 @@ def test_invalid_data_unavailable(spec, state):
     # data unavailable
     blob_data = BlobData([], [])
 
-    def run_func_1():
-        yield from tick_and_add_block(spec, store, signed_block, test_steps, blob_data=blob_data, valid=False)
-
-    yield from with_blob_data(spec, blob_data, run_func_1)
+    yield from tick_and_add_block_with_data(spec, store, signed_block, test_steps, blob_data, valid=False)
+
+    assert spec.get_head(store) != signed_block.message.hash_tree_root()
+
+    yield 'steps', test_steps
+
+
+@with_deneb_and_later
+@spec_state_test
+def test_invalid_wrong_proofs_length(spec, state):
+    rng = Random(1234)
+
+    test_steps = []
+    # Initialization
+    store, anchor_block = get_genesis_forkchoice_store_and_block(spec, state)
+    yield 'anchor_state', state
+    yield 'anchor_block', anchor_block
+    current_time = state.slot * spec.config.SECONDS_PER_SLOT + store.genesis_time
+    on_tick_and_append_step(spec, store, current_time, test_steps)
+    assert store.time == current_time
+
+    # On receiving a block of `GENESIS_SLOT + 1` slot
+    block, blobs, _ = get_block_with_blob(spec, state, rng=rng)
+    signed_block = state_transition_and_sign_block(spec, state, block)
+
+    # unavailable proofs
+    blob_data = BlobData(blobs, [])
+
+    yield from tick_and_add_block_with_data(spec, store, signed_block, test_steps, blob_data, valid=False)
+
+    assert spec.get_head(store) != signed_block.message.hash_tree_root()
+
+    yield 'steps', test_steps
+
+
+@with_deneb_and_later
+@spec_state_test
+def test_invalid_wrong_blobs_length(spec, state):
+    rng = Random(1234)
+
+    test_steps = []
+    # Initialization
+    store, anchor_block = get_genesis_forkchoice_store_and_block(spec, state)
+    yield 'anchor_state', state
+    yield 'anchor_block', anchor_block
+    current_time = state.slot * spec.config.SECONDS_PER_SLOT + store.genesis_time
+    on_tick_and_append_step(spec, store, current_time, test_steps)
+    assert store.time == current_time
+
+    # On receiving a block of `GENESIS_SLOT + 1` slot
+    block, _, blob_kzg_proofs = get_block_with_blob(spec, state, rng=rng)
+    signed_block = state_transition_and_sign_block(spec, state, block)
+
+    # unavailable blobs
+    blob_data = BlobData([], blob_kzg_proofs)
+
+    yield from tick_and_add_block_with_data(spec, store, signed_block, test_steps, blob_data, valid=False)
 
     assert spec.get_head(store) != signed_block.message.hash_tree_root()
 
diff --git a/tests/core/pyspec/eth2spec/test/helpers/fork_choice.py b/tests/core/pyspec/eth2spec/test/helpers/fork_choice.py
index a6babefd3..ba4f294bc 100644
--- a/tests/core/pyspec/eth2spec/test/helpers/fork_choice.py
+++ b/tests/core/pyspec/eth2spec/test/helpers/fork_choice.py
@@ -73,6 +73,13 @@ def tick_and_add_block(spec, store, signed_block, test_steps, valid=True,
     return post_state
 
 
+def tick_and_add_block_with_data(spec, store, signed_block, test_steps, blob_data, valid=True):
+    def run_func():
+        yield from tick_and_add_block(spec, store, signed_block, test_steps, blob_data=blob_data, valid=valid)
+
+    yield from with_blob_data(spec, blob_data, run_func)
+
+
 def add_attestation(spec, store, attestation, test_steps, is_from_block=False):
     spec.on_attestation(store, attestation, is_from_block=is_from_block)
     yield get_attestation_file_name(attestation), attestation