As I mentioned above… I had similar problems and I was sure that I didn’t change a single thing. So it turned out that the problem was happening in my Router at home. I had a rebind-protection enabled and needed to turn it off to be able to reach my server again, correctly. try it out with your router (or maybe you’re running pihole or similar).
and I re-established all my open ports for my nc-server… meaning I deleted them all… and set them completely new.
I just updated to 30.0.1 and this particular problem is gone.
The maps app is listed as unsupported and I disabled it before updating. I re-enabled it as an untested up after updating to 30.0.1, and it appears to be working. I don’t really use it, though, so there may be some problems.
I had one scare during the update. I got a message that the calendar and contacts apps were unsupported and being disabled. After the update was complete, they were not disabled and seemed to be functioning normally.
My only remaining item in “Security & setup warnings” is due to using version 10.3 of MariaDB. That’s just me still using Ubuntu 20.04. It’s probably time to upgrade.