`preview-hidden-comments` no longer works for most types #3647

The preview-hidden-comments feature isn't working probably because GitHub started hiding some reasons why a comment has been hidden:

<img width="591" alt="" src="https://user-images.githubusercontent.com/1402241/95822633-e85d1c80-0cf1-11eb-8ec2-7f05a70f94bd.png">

I'll add and hide comments below as a live example.

Here's the originally-allowed types for reference:

https://github.com/sindresorhus/refined-github/blob/c6c727ca571c91d1ff426e218ccadb075cdb2af6/source/features/preview-hidden-comments.tsx#L9

Originally reported in https://github.com/sindresorhus/refined-github/pull/3621#issuecomment-707895439