The statistics of miss-peer is not accurate sometimes
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severity/moderate
type/bug
- Dominant language
- Go
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Description
## Bug Report
### What did you do?
Use pd-ctl to set the max-replicas to 2 with a cluster having 15w regions. And after all extra peers are removed, change back the max-replicas to 3.

As you can see from the above screenshot, after changing back the parameters, there should be a lot of missing peers. But actually, there are a few missing peers.
### What version of PD are you using (`pd-server -V`)?
master
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