[Bug] bug in defaultSimpleConsumer ack error handling

[r27153733]

Before Creating the Bug Report

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

• [X] I have searched the GitHub Issues and GitHub 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.

Programming Language of the Client

Go

Runtime Platform Environment

archlinux

RocketMQ Version of the Client/Server

b4a47a933dd1839d770b02bc7c385673a7ba9954

Run or Compiler Version

golang 1.22

Describe the Bug

实际有错误但ack返回nil。

Steps to Reproduce

生产者：发送一条消息 消费者：接收消息，等待几分钟在ack, 使ack err。

What Did You Expect to See?

正确返回错误

What Did You See Instead?

返回nil

Additional Context

No response