I tried to update all my packages after a kernel upgrade with {{emerge --update --newuse --deep --with-bdeps=y @world }} and I got
emerge: there are no ebuilds to satisfy "media-libs/openexr:3/3.1.3=". (dependency required by "kde-apps/kio-extras-21.08.1::kde-kit" [installed]) (dependency required by "kde-plasma/plasma-workspace-5.22.5::kde-kit" [installed]) (dependency required by "kde-plasma/plasma-browser-integration-5.22.5::kde-kit" [installed]) (dependency required by "kde-plasma/plasma-meta-5.22.5::kde-kit[browser-integration]{" [installed]) (dependency required by "@selected" [set]) (dependency required by "@world" [argument]