I am currently having issues with my instance. Upon upgrading to the new version, I cannot see any existing scene, though actors and other items are correctly ported over. Looking up online, it seems like it could be an issue with some modules. I tried disabling and reenabling all of them (though they are disabled by default), but it seems to not solve the issue.
Most likely I'll try to manually uninstall them (not disable) while still in V10, upgrade to V11 + upgrade PF2 to v5, and only then reinstall the modules (if scenes load correctly).
I'll keep y'all posted