Full URL links to communities appear to open fine - even if the instance isn’t aware of that community (hurray! thank you for this, it’s ace!)
However, links with exclamation marks seem to try to open a user.
I’m going to try putting one in here, but I’m posting from kbin so it might go a bit weird or not exhibit the same problem.
!lemmings
Yeah I noticed the same thing. I could be wrong, but I thought this used to work in a previous version.