Fix block hash computation for fork transition tests

When overriding `execution_requests`, have to sync EL payload block hash
as the requests are linked to it. Note that this was only caught now
because the new request tests were added after the latest fixes applied.

tests/core/pyspec/eth2spec/test/helpers/fork_transition.py

@@ -23,11 +23,15 @@
     prepare_state_and_deposit,
     prepare_deposit_request,
 )
+from eth2spec.test.helpers.execution_payload import (
+    compute_el_block_hash_for_block,
+)
 from eth2spec.test.helpers.proposer_slashings import (
     get_valid_proposer_slashing,
 )
 from eth2spec.test.helpers.forks import (
     get_next_fork_transition,
+    is_post_bellatrix,
     is_post_electra,
 )
 from eth2spec.test.helpers.state import (
@@ -57,13 +61,15 @@ class OperationType(Enum):
     CONSOLIDATION_REQUEST = auto()
 
 
-def _set_operations_by_dict(block, operation_dict):
+def _set_operations_by_dict(spec, block, operation_dict):
     for key, value in operation_dict.items():
         # to handle e.g. `execution_requests.deposits` and `deposits`
         obj = block.body
         for attr in key.split('.')[:-1]:
             obj = getattr(obj, attr)
         setattr(obj, key.split('.')[-1], value)
+    if is_post_bellatrix(spec):
+        block.body.execution_payload.block_hash = compute_el_block_hash_for_block(spec, block)
 
 
 def _state_transition_and_sign_block_at_slot(spec,
@@ -87,7 +93,7 @@ def _state_transition_and_sign_block_at_slot(spec,
         block.body.sync_aggregate = sync_aggregate
 
     if operation_dict:
-        _set_operations_by_dict(block, operation_dict)
+        _set_operations_by_dict(spec, block, operation_dict)
 
     assert state.latest_block_header.slot < block.slot
     assert state.slot == block.slot
@@ -403,7 +409,7 @@ def _check_state():
     if is_right_before_fork:
         # add a block with operation.
         block = build_empty_block_for_next_slot(spec, state)
-        _set_operations_by_dict(block, operation_dict)
+        _set_operations_by_dict(spec, block, operation_dict)
         signed_block = state_transition_and_sign_block(spec, state, block)
         blocks.append(pre_tag(signed_block))