fix not do sequence action instantly

op-node/rollup/driver/sequencer.go

@@ -137,8 +137,8 @@ func (d *Sequencer) PlanNextSequencerAction() time.Duration {
 	buildingOnto, buildingID, _ := d.engine.BuildingPayload()
 
 	// We may have to wait till the next sequencing action, e.g. upon an error.
-	// Delay when sequencer action failed
-	if delay := d.nextAction.Sub(now); delay > 0 {
+	// If the head changed we need to respond and will not delay the sequencing.
+	if delay := d.nextAction.Sub(now); delay > 0 && buildingOnto.Hash == head.Hash {
 		return delay
 	}
 

op-node/rollup/driver/state.go

@@ -269,17 +269,7 @@ func (s *Driver) eventLoop() {
 				// This may adjust at any time based on fork-choice changes or previous errors.
 				//
 				// update sequencer time if the head changed
-				delay := s.sequencer.PlanNextSequencerAction()
-				if delay == 0 {
-					// immediately do sequencerStep if time is ready
-					if err := sequencerStep(); err != nil {
-						return
-					}
-					// sequencerStep was already done, so we continue to next round
-					continue
-				} else {
-					planSequencerAction()
-				}
+				planSequencerAction()
 			}
 		} else {
 			sequencerCh = nil