It you use Kinoite prerelease for Plasma6 you may want to rebase to Fedora 40.
Fedora 40 is still prerelease but rawhide is already on branch 41. This may cause issues with some repositories, and Plasma6 is added and updated on Fedora 40.
rpm-ostree rebase --reboot ostree-unverified-registry:quay.io/fedora-ostree-desktops/kinoite:40
or the classic ostree remote
rpm-ostree rebase --reboot fedora:fedora/40/x86_64/kinoite
You may need to rpm-ostree reset
if you layered packages, especially KDE apps. Afterwards I recommed to layer as many KDE apps as possible, to be able to report bugs.