Before Creating the Bug Report

• I found a bug, not just asking a question, which should be created in GitHub Discussions.

• I have searched the GitHub Issues and GitHub Discussions of this repository and believe that this is not a duplicate.

• I have confirmed that this bug belongs to the current repository, not other repositories of RocketMQ.

Runtime platform environment

Centos

RocketMQ version

5.2.1

JDK Version

11

Describe the Bug

When asynchronously sending messages, if num is obtained but size is not obtained under the back pressure control, num cannot be released and the sending rate is affected.

Steps to Reproduce

null

What Did You Expect to See?

When asynchronously sending messages, if num is obtained but size is not obtained under the back pressure control,num can be released, which affects the sending rate.

What Did You See Instead?

null

Additional Context

No response