Cage (Wayland compositor) is broken

Launching cage makes the computer unusable. Could reproduce with the intel video driver and qemu-virtio.

cage -- /usr/bin/firefox

Some investigation can be seen here: https://gitlab.com/postmarketOS/pmaports/-/issues/469 as it was noticed because it breaks Kodi on postmarketOS. Kodi works using an other compositor based on wlroots like Sway.