No, just some of them. Another problematic one is #ТакиеДела. Other Cyrillic tags work, e.g. #УвиделТут or #велосипед. I don't know any English terms which don't work but I don't think it is related to language. If I use slightly modified problematic tag, e.g. #Москва2020 - it works, it starts to appear in search and suggestions, etc.

It seems like these specific tags got stuck somewhere during upgrade.

Here's an example post with two problematic tags and one working.
https://friends.deko.cloud/display/d0446be5-385f-131a-1a27-500497036827