Initialize L1 Safe and Finalized head in SyncStatus at OpNode startup

op-node/node/node.go

@@ -568,6 +568,33 @@ func (n *OpNode) Start(ctx context.Context) error {
 		return err
 	}
 	log.Info("Rollup node started")
+
+	// If n.cfg.Driver.SequencerUseFinalized is true, sequencer does not fetch non-finalized L1 blocks.
+	// The OpNode periodically fetches the latest safe and finalized L1 block heights (1 epoch ≒ 6.4 minutes by default),
+	// but these values are not available immediately after startup until the first polling occurs.
+	// In some cases, this can cause the sequencer to get stuck because it fails to retrieve the next L1 block.
+	// To prevent this, fetch and initialize the latest safe and finalized L1 block references at startup.
+	if n.cfg.Driver.SequencerUseFinalized {
+		reqCtx, reqCancel := context.WithTimeout(ctx, time.Second*20)
+		defer reqCancel()
+
+		safeRef, err := n.l1Source.L1BlockRefByLabel(reqCtx, eth.Safe)
+		if err != nil {
+			return fmt.Errorf("failed to fetch L1 safe head: %w", err)
+		}
+		if safeRef != (eth.L1BlockRef{}) {
+			n.OnNewL1Safe(reqCtx, safeRef)
+		}
+
+		finalizedRef, err := n.l1Source.L1BlockRefByLabel(reqCtx, eth.Finalized)
+		if err != nil {
+			return fmt.Errorf("failed to fetch L1 finalized head: %w", err)
+		}
+		if finalizedRef != (eth.L1BlockRef{}) {
+			n.OnNewL1Finalized(reqCtx, finalizedRef)
+		}
+	}
+
 	return nil
 }