After setting the number of TiFlash replicas, there is no progress. How to troubleshoot the issue?

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This topic has been translated from a Chinese forum by GPT and might contain errors.

Original topic: 设置tiflash副本数之后一直没有进度，怎么查问题呢？

| username: Running

The result viewed through TIFLASH_REPLICA is as above:

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| username: h5n1 | Original post link
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| username: TiDBer_小阿飞 | Original post link
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| username: swino | Original post link

Refer to the article above.