@funkwhale if that helps you can install the version you want in CLI by git cloning then checkouting on the disered version then "yunohost app install /path/to/clone/repo"
I'm expecting the bug here to be related to bad unicode handling in python (yet again...) probably triggered by different locales for different users.
Good luck with that kind of bug :/
Important PSA for Funkwhale admins using YunoHost
Looks like we cannot reproduce the issue anymore. Can someone perform a backup of their pod (db and media files) and try an upgrade?