bvbfan Probably package issue, i've using Discover with flatpak and flathub configured, also installed applications, that's on 5.20.5. Now (kde-next Discover) flathub did not present in configuration also my applications are gone.
demm bvbfan Probably package issue No, issue is in new appstream, known upstream, that is why new appstream did not move out of the build repo. https://bugs.kde.org/show_bug.cgi?id=432492 Just install appstream from the apps repo, until appstream 0.14.0 is replaced. (workaround is to remove the flatpak cache, that will also fix the discover start-up crash).
bvbfan dconf should be depend in flatpak, now Discover refuses to start, probably some configuration in flatpak is required.