Check if you have ‘show read posts’ unchecked. If that is unchecked ypur posts wont show. Since you made them, technically you have read them, lol

Thank you! Oh wow, that is silly.

I tried to use that feature to tame the feed from shoving me the ever same posts. I had never thought it would apply to own posts.

I could also not see posts in the small communities of my small instance. Yes, of course, I’ve opened them all before. Now everything is fine.