On one of my machines, I am completely unable to log out. The behavior is slightly different depending on whether I am in Wayland or X11.

Wayland

1. Clicking log out and then OK in the log out window brings me back to the desktop.
2. Doing this again does the same thing
3. Clicking log out for a third time does nothing

X11

1. Clicking log out will lead me to a black screen with just my mouse cursor.

In my journalctl logs, I see:

Apr 03 21:52:46 arch-nas systemd[1]: Stopping User Runtime Directory /run/user/972...
Apr 03 21:52:46 arch-nas systemd[1]: run-user-972.mount: Deactivated successfully.
Apr 03 21:52:46 arch-nas systemd[1]: user-runtime-dir@972.service: Deactivated successfully.
Apr 03 21:52:46 arch-nas systemd[1]: Stopped User Runtime Directory /run/user/972.
Apr 03 21:52:46 arch-nas systemd[1]: Removed slice User Slice of UID 972.
Apr 03 21:52:46 arch-nas systemd[1]: user-972.slice: Consumed 1.564s CPU time.
Apr 03 21:52:47 arch-nas systemd[1]: dbus-:1.2-org.kde.kded.smart@0.service: Deactivated successfully.
Apr 03 21:52:47 arch-nas systemd[1]: dbus-:1.2-org.kde.powerdevil.discretegpuhelper@0.service: Deactivated successfully.
Apr 03 21:52:47 arch-nas systemd[1]: dbus-:1.2-org.kde.powerdevil.backlighthelper@0.service: Deactivated successfully.
Apr 03 21:52:48 arch-nas systemd[1]: dbus-:1.2-org.kde.powerdevil.chargethresholdhelper@0.service: Deactivated successfully.
Apr 03 21:52:54 arch-nas systemd[4500]: Created slice Slice /app/dbus-:1.2-org.kde.LogoutPrompt.
Apr 03 21:52:54 arch-nas systemd[4500]: Started dbus-:1.2-org.kde.LogoutPrompt@0.service.
Apr 03 21:52:54 arch-nas ksmserver-logout-greeter[5553]: qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
Apr 03 21:52:54 arch-nas ksmserver-logout-greeter[5553]: kf.windowsystem: static bool KX11Extras::compositingActive() may only be used on X11
Apr 03 21:52:54 arch-nas plasmashell[5079]: qt.qpa.wayland: eglSwapBuffers failed with 0x300d, surface: 0x0
Apr 03 21:52:55 arch-nas systemd[4500]: Created slice Slice /app/dbus-:1.2-org.kde.Shutdown.
Apr 03 21:52:55 arch-nas systemd[4500]: Started dbus-:1.2-org.kde.Shutdown@0.service.
Apr 03 21:52:55 arch-nas systemd[4500]: Stopped target plasma-workspace-wayland.target.
Apr 03 21:52:55 arch-nas systemd[4500]: Stopped target KDE Plasma Workspace.
Apr 03 21:52:55 arch-nas systemd[4500]: Requested transaction contradicts existing jobs: Transaction for  is destructive (drkonqi-coredump-pickup.service has 'start' job queued, but 'stop' is included in transaction).
Apr 03 21:52:55 arch-nas systemd[4500]: graphical-session.target: Failed to enqueue stop job, ignoring: Transaction for graphical-session.target/stop is destructive (drkonqi-coredump-pickup.service has 'start' job queued, but 'stop' is included in transaction).
Apr 03 21:52:55 arch-nas systemd[4500]: Stopped target KDE Plasma Workspace Core.
Apr 03 21:52:55 arch-nas systemd[4500]: Stopped target Startup of XDG autostart applications.
Apr 03 21:52:55 arch-nas systemd[4500]: Stopped target Session services which should run early before the graphical session is brought up.
Apr 03 21:52:55 arch-nas systemd[4500]: dbus-:1.2-org.kde.LogoutPrompt@0.service: Main process exited, code=exited, status=1/FAILURE
Apr 03 21:52:55 arch-nas systemd[4500]: dbus-:1.2-org.kde.LogoutPrompt@0.service: Failed with result 'exit-code'.graphical-session.target/stop

I’ve filed an upstream bug for this but I was wondering if anyone else here was also experiencing the same issue.