lizhimins commented on issue #9583:
URL: https://github.com/apache/rocketmq/issues/9583#issuecomment-3141932321

   When the first pop operation is used to get messages, the server generates 
an initial handle A. If the visibility timeout is extended via the change 
invisiable time operation, the server creates a new handle B and triggers a 
state transition (effectively invalidating A and activating B). At this point, 
attempting to acknowledge the message using the old handle A will fail, as only 
the new handle B is valid for acknowledgment


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