From 2767f08f4d3beac511d81973b28a0626cb800043 Mon Sep 17 00:00:00 2001
From: Potuz <potuz@prysmaticlabs.com>
Date: Mon, 29 Dec 2025 08:39:12 -0300
Subject: [PATCH] Do not send FCU on block batches (#16199)

On block batches the engine does not need to be notified of FCU, only on
regular sync at the end of sync it's useful to notify the engine.
---
 beacon-chain/blockchain/process_block.go | 8 --------
 changelog/potuz_no_fcu_on_batches.md     | 2 ++
 2 files changed, 2 insertions(+), 8 deletions(-)
 create mode 100644 changelog/potuz_no_fcu_on_batches.md

diff --git a/beacon-chain/blockchain/process_block.go b/beacon-chain/blockchain/process_block.go
index a15563ad21..f3297312d9 100644
--- a/beacon-chain/blockchain/process_block.go
+++ b/beacon-chain/blockchain/process_block.go
@@ -295,14 +295,6 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []consensusblocks.ROBlo
 			return errors.Wrap(err, "could not set optimistic block to valid")
 		}
 	}
-	arg := &fcuConfig{
-		headState: preState,
-		headRoot:  lastBR,
-		headBlock: lastB,
-	}
-	if _, err := s.notifyForkchoiceUpdate(ctx, arg); err != nil {
-		return err
-	}
 	return s.saveHeadNoDB(ctx, lastB, lastBR, preState, !isValidPayload)
 }
 
diff --git a/changelog/potuz_no_fcu_on_batches.md b/changelog/potuz_no_fcu_on_batches.md
new file mode 100644
index 0000000000..3eac4a81a7
--- /dev/null
+++ b/changelog/potuz_no_fcu_on_batches.md
@@ -0,0 +1,2 @@
+### Ignored
+- D  not send FCU on block batches.