Fix on block w/ missing payload envelope

consensus/fork_choice/src/fork_choice.rs

@@ -134,6 +134,7 @@ impl ResetPayloadStatuses {
 #[derive(Debug)]
 pub enum InvalidBlock {
     UnknownParent(Hash256),
+    ParentPayloadNotVerified(Hash256),
     FutureSlot {
         current_slot: Slot,
         block_slot: Slot,
@@ -818,6 +819,19 @@ where
             .get_block(&block.parent_root())
             .ok_or_else(|| Error::InvalidBlock(InvalidBlock::UnknownParent(block.parent_root())))?;
 
+        // If the block builds on a full payload envelope, the envelope must be known. 
+        if let Some(parent_block_hash) = parent_block.execution_payload_block_hash {
+            let builds_on_full = block
+                .body()
+                .signed_execution_payload_bid()
+                .is_ok_and(|bid| bid.message.parent_block_hash == parent_block_hash);
+            if builds_on_full && !self.is_payload_received(&block.parent_root()) {
+                return Err(Error::InvalidBlock(InvalidBlock::ParentPayloadNotVerified(
+                    block.parent_root(),
+                )));
+            }
+        }
+
         // Blocks cannot be in the future. If they are, their consideration must be delayed until
         // they are in the past.
         //