Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

Load some data into a table
Add tiflash replica for the table
Set tiflash replica to zero, sometime PD didn't remove (all) related region peers from tiflash
Wait tiflash replica data be GCed
Add tiflash replica back

ref #8695

2. What did you expect to see? (Required)

3. What did you see instead (Required)

4. What is your TiFlash version? (Required)

nightly, v7.5.0