Reinstalling the firewall solved it for me. Still this is very buggy, and I'm afraid that a lot of servers are not protected the way they think they are at the moment. So for future confidence, please also fix this with a generic update.
After upgrading to Obsidian, all my firewall rules are being ignored. In iptables they appear to be present correctly (see attached screenshots)
I tried updatig them and restarting, but I can still connect to the service(s) from any IP.
Please advise how to proceed.