Labwc just upgraded to 0.8.2-1. After a log out/in it failed to start and froze at lightdm forcing a power cycle and then log into X.
Xfce4 with Labwc.
https://linuxnews.de/xfce-4-20-wayland-unterstuetzung-und-noch-viel-mehr/
https://wiki.xfce.org/releng/wayland_roadmap#testing
https://gitlab.xfce.org/xfce/xfce4-session/-/issues/209
Figured it out. The update overwrote the /usr/share/wayland-sessions/labwc.desktop file. I created a separate one to start xfce4 and labwc together so this doesn't happen again on the next update.
Edit the Exec line to read: Exec=startxfce4 --wayland
This will start xfce4 with labwc as it's default compositor.