Plasma.log

startplasmacompositor: Starting up...
dbus-update-activation-environment: warning: error sending to systemd: org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.systemd1 was not provided by any .service files
qt.qpa.plugin: Could not load the Qt platform plugin "wayland-org.kde.kwin.qpa" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: wayland-org.kde.kwin.qpa, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.

/run/current-system/sw/bin/startplasmacompositor: line 283:  4662 Aborted                 (core dumped) /nix/store/6d0s7par6wsg668m7vks6ym4xdafz49q-kwin-5.16.5-bin/bin/kwin_wayland --xwayland --libinput --exit-with-session=/nix/store/fsvhg692l3lfv7p7gwqfqrxgflbjjnlk-plasma-workspace-5.16.5/libexec/startplasma
startplasmacompositor: Shutting down...
startplasmacompositor: Done.