fujian-zfj opened a new issue, #7914: URL: https://github.com/apache/rocketmq/issues/7914
### Before Creating the Bug Report - [X] I found a bug, not just asking a question, which should be created in [GitHub Discussions](https://github.com/apache/rocketmq/discussions). - [X] I have searched the [GitHub Issues](https://github.com/apache/rocketmq/issues) and [GitHub Discussions](https://github.com/apache/rocketmq/discussions) of this repository and believe that this is not a duplicate. - [X] I have confirmed that this bug belongs to the current repository, not other repositories of RocketMQ. ### Runtime platform environment linux ### RocketMQ version 5.2 ### JDK Version jdk 1.8 ### Describe the Bug   ### Steps to Reproduce 1.keep send messages to broker 2.start pop consumer, then every pop request may pull 0 ~ 32 messages, 3.ack messages randomly ### What Did You Expect to See? Those messages unacked should be sent to retryTopic, then be consumed by consumer util being acked. ### What Did You See Instead? Some unacked messages were lost. ### Additional Context _No response_ -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@rocketmq.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org