I've been running my desktop with the libinput version 1.10.3-2 and touchpad enabled for hours now, so I consider this bug resolved.
- Bug#893178: gdm3 crashes: tp_tap_handle_state: Assertion `t... Nico Rikken
- Bug#893178: Wayland attempt Nico Rikken
- Bug#893178: Seems to be fixed upstream Nico Rikken
- Bug#893178: Disabling touchpad works as a mitigation s... Nico Rikken
- Bug#893178: libinput upgrade fixed this bug Nico Rikken
- Bug#893178: gdm3 crashes: tp_tap_handle_state: Asserti... Simon McVittie
