l786170309 opened a new issue #5543: Is this normal？The "msgBacklog" is "-2". URL: https://github.com/apache/pulsar/issues/5543 **Describe the bug** I use the exclusive consumer to receive messages and ack them, but I found some message lost. So I check the stats of the topic, and I found "msgBacklog" is "-2". I do not konw how this happened. Is there any reason to explain it? **To Reproduce** I do not how to reproduce the behavio. **Screenshots**  \
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