fix: use empty withdrawals if parent has withdrawals root (#16980)

crates/rpc/rpc/src/eth/helpers/pending_block.rs

@@ -67,7 +67,7 @@ where
             prev_randao: B256::random(),
             gas_limit: parent.gas_limit(),
             parent_beacon_block_root: parent.parent_beacon_block_root().map(|_| B256::ZERO),
-            withdrawals: None,
+            withdrawals: parent.withdrawals_root().map(|_| Default::default()),
         }
         .into())
     }