I found some similar topics, but nothing that seamed related to my issu.
I have this error message in my panel. Activating Debug doesn’t show anything.
My host is Fortrabbit. I just realized the bug. I think the last thing I did was update Kirby to 188.8.131.52. That being said, the local version works as expected (with Laravel Valet, PHP 8)!
Here are my Fortrabbit settings (with PHP 7.4, but changing it to 8 didn’t seams to resolve the issu).