Mouse stops working after doing zypper system update

After I did a system update, my mouse cursor would not move at all after reboot. Going back to a previous snapshot fixed the problem but I have no idea what caused the issue in the update. Is this common and would there be a way to debug this?

This has happened around here quite a bit lately, though not directly after a dup, or necessarily on TW. Unplugging and replugging mouse usually works.