Unable to remove reviewers occasionally

[devversion]

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Bug

Body

Hi team,

Regularly on GitHub we are seeing issues where a pending reviewer cannot be removed from a pull request (note: we do not use codeowners). When the UI combobox for reviewers opens, we can uncheck the reviewer, but upon closing the panel, the reviewer is not removed. This can be tried repeatedly but never ends up working.

Reproduction Steps

Here is an example where alxhub@ cannot be removed: angular/angular#51807

Unclear how it can be reproduced. It happens randomly. I suspect somehow the internal state is messed up when a PR is created, reviewers are requested by a bot (and then sometimes removed by the user via UI again where the bot re-adds reviewers instantly).

Here is a video:

Screen.Recording.2023-08-24.at.16.04.21.1.mov

The devtools show an error when the reviewers are removed and the panel closes. Somehow a 404 is returned.

Trying to remove the reviewer via REST API does not work either.

Fault Type
Permanent - Occurring repeatably

Blocking?
Yes, with strict reviewer policies, this can block merging PRs

[AceCoderLaura]

I've had this same issue on a PR that was closed two years ago. It's been stuck on my review-requested:@me list for years, it would be nice to get rid of it.

[j18ter]

This continues to be annoying for me too. How can we get this raised in priority to see some action?

[HughWarrington]

For me this is not occasionally, it is every time I am initially creating a PR.

[colinhowe]

+1 I'm starting to see this from time to time. Really frustrating as reviews just start piling up :(