I think this may have started with the attempt to update to 0.5.1, as per Umbrel 0.5.1 is out with app release notes and bug fixes
I’ve tried using iptables to remap 1.1.1.1 and 8.8.8.8 to my router/dns proxy, which works for dns lookups on the command line, but most of the apps are still stuck on “starting”.