keep fcU consistent with actual DAG (#3748)

beacon_chain/gossip_processing/block_processor.nim

@@ -482,7 +482,7 @@ proc runQueueProcessingLoop*(self: ref BlockProcessor) {.async.} =
         executionPayloadStatus
 
       await self.runForkchoiceUpdated(
-        blck.blck.bellatrixData.message.body.execution_payload.block_hash,
+        self.consensusManager.dag.head.executionBlockRoot,
         self.consensusManager.dag.finalizedHead.blck.executionBlockRoot)
 
       if not blck.resfut.isNil:

beacon_chain/sync/sync_queue.nim

@@ -696,7 +696,7 @@ proc push*[T](sq: SyncQueue[T], sr: SyncRequest[T],
         of SyncQueueKind.Forward:
           if safeSlot < req.slot:
             let rewindSlot = sq.getRewindPoint(failSlot, safeSlot)
-            warn "Unexpected missing parent, rewind happens",
+            debug "Unexpected missing parent, rewind happens",
                  request = req, rewind_to_slot = rewindSlot,
                  rewind_point = sq.rewind, finalized_slot = safeSlot,
                  blocks_count = len(item.data),