next just switched to kde-kit:5.23-testing and now the following happens:

emerge: there are no ebuilds to satisfy ">=dev-libs/plasma-wayland-protocols-1.4.0".
(dependency required by "kde-frameworks/kwayland-5.89.0::kde-kit" [ebuild])
(dependency required by "kde-frameworks/plasma-5.89.0::kde-kit[wayland]" [ebuild])
(dependency required by "kde-plasma/plasma-pa-5.23.5::kde-kit" [ebuild])
(dependency required by "kde-plasma/plasma-meta-5.23.5::kde-kit[pulseaudio]" [ebuild])
(dependency required by "plasma-meta" [argument])

plasma-wayland-protocols-1.5.0 in gentoo-staging merged fine after changing the EAPI to 7