You can see a post with comments on my feed.
When i now open the post, i see no comments. I have no word blocks nor are the users/instances blocked. I can see the comments on my instances webview (feddit.org).
Does anybody have any hints as to why this is happening?
Language settings. Check your profile settings on desktops.
It's likely this, I had this same problem as well and language settings were the issue.