I have the wayland USE flag set with KDE as desktop environment which can use wayland. But the wayland plugin isnt installed because the qtwayland package is not a dependancy so KDE currently doesnt run on wayland for Gentoo. If I install the package manually the wayland plugin is found.
kwayland-5.25.0 will pull this in: https://gitweb.gentoo.org/proj/kde.git/commit/?id=b2f587ac6a535b4e8ab7807851623bc8c0e3f78f
Thanks, backported to 5.24.0. https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=0534dc16d6a70d67293b52d69ce31f0b6500c444