Appears plasma-discover's flatpak backend isn't installed by default as far as I can tell.
Options: 1 do nothing 2 do install plasma-discover-flatpak by default 3 do install plasma-discover-flatpak by default on kinoite only, by default
Metadata Update from @rdieter: - Issue assigned to rdieter
Voting for option 2. It is currently enabled in Kinoite (I have not figured out exactly why yet).
This should do the trick, https://src.fedoraproject.org/rpms/plasma-discover/c/f3a83c85952db79fd4b5bddd320b47260f9e68df
Metadata Update from @rdieter: - Issue close_status updated to: Fixed - Issue status updated to: Closed (was: Open)