diff --git a/tests/core/pyspec/eth2spec/test/deneb/sanity/test_blocks.py b/tests/core/pyspec/eth2spec/test/deneb/sanity/test_blocks.py
index 2af330efb..3b2a767f0 100644
--- a/tests/core/pyspec/eth2spec/test/deneb/sanity/test_blocks.py
+++ b/tests/core/pyspec/eth2spec/test/deneb/sanity/test_blocks.py
@@ -1,16 +1,24 @@
 from eth2spec.test.helpers.state import (
-    state_transition_and_sign_block
+    state_transition_and_sign_block,
+    next_epoch_via_block,
+    transition_to,
 )
 from eth2spec.test.helpers.block import (
-    build_empty_block_for_next_slot
+    build_empty_block_for_next_slot,
 )
 from eth2spec.test.context import (
+    DENEB,
     spec_state_test,
+    spec_configured_state_test,
     with_deneb_and_later,
+    with_phases,
 )
 from eth2spec.test.helpers.execution_payload import (
     compute_el_block_hash,
 )
+from eth2spec.test.helpers.attestations import (
+    get_valid_attestation,
+)
 from eth2spec.test.helpers.sharding import (
     get_sample_opaque_tx,
 )
@@ -58,3 +66,35 @@ def test_max_blobs_per_block(spec, state):
 @spec_state_test
 def test_invalid_exceed_max_blobs_per_block(spec, state):
     yield from run_block_with_blobs(spec, state, blob_count=spec.MAX_BLOBS_PER_BLOCK + 1, valid=False)
+
+
+@with_phases([DENEB])
+@spec_configured_state_test({
+    'DENEB_FORK_EPOCH': 2,
+})
+def test_include_attestation_from_previous_fork_with_new_range(spec, state):
+    # Transition to the epoch prior to the fork epoch
+    next_epoch_via_block(spec, state)
+
+    # Generate an attestation for slot 0 of this epoch
+    attestation = get_valid_attestation(spec, state, signed=True)
+
+    # Transition to second to last slot in `DENEB_FORK_EPOCH
+    next_epoch_via_block(spec, state)
+    current_epoch = spec.get_current_epoch(state)
+    assert current_epoch == spec.config.DENEB_FORK_EPOCH
+    penultimate_slot = spec.compute_start_slot_at_epoch(current_epoch + 1) - 2
+    transition_to(spec, state, penultimate_slot)
+
+    # Ensure the new state is in the increased EIP-7045 slot inclusion range
+    assert penultimate_slot - attestation.data.slot > spec.SLOTS_PER_EPOCH
+
+    block = build_empty_block_for_next_slot(spec, state)
+    block.body.attestations.append(attestation)
+
+    yield 'pre', state
+
+    signed_block = state_transition_and_sign_block(spec, state, block)
+
+    yield 'blocks', [signed_block]
+    yield 'post', state