Yup, sorry that’s a bug due to the fact that yunohost-api was not restarted automatically at the end of the upgrade.
I fixed the issue upstream, but one way to fix the issue is to restart yunohost-api. It’s doable from the webadmin, in Services > yunohost-api, but it’s a bit funky because the api will kill itself to self-restart … You can also do it from the command line with sudo systemctl restart yunohost-api