I upgraded to Cloudron 8.0 on Ubuntu 22.04 and on reboot had OIDC errors on all apps that were using Cloudron login for some reason. Everything else was working fine though.
I spun up a clean Ubuntu 24.04 machine, installed Cloudron 8 clean and then reinstalled each app from its backup and they all worked.
I considered this a good test of backup / restore anyway but not sure why i was getting authentication errors. I still have the partial broken VM shutdown and now using new VM so all is fine.