Make sure the bug is caused by Refined GitHub. Try disabling the extension first.
It is caused by Refined GitHub and disabling the extension fixes the issue.
Include a full URL where the bug appears.
On any repository
Include a screenshot/gif

See at github-changelog →_→ https://github.blog/changelog/2020-11-20-custom-notification-controls/
Details

@dnknn yes I read the changelog post.
It does it not work for me. When i click the "custom" option, the popup just disappears. But when i disable the extension, it works fine.
As you said, this is an incompatible Bug of refined-github extension,
You can check DevTools \
I will look into the issue shortly and take care of it.
Thanks for the report
Its hide-watch-and-fork-count I am going to disable the feature until we get it resolved. There is no need to update the extension, we can disable it globally (for all users).
I'm glad that the hotfix feature became useful. Let's always use it as soon as something like this happens since fixing always takes longer.
I was actually excited to use it for the first time :sunglasses:
Most helpful comment
I will look into the issue shortly and take care of it.
Thanks for the report