Recent update changed the event name for Axis events, so I had to update my mousemapper script
https://github.com/uphillian/wayland-mouse-mapper
The Axis changed from -15 +15 to -15/120.* +15/120.* so I had to update the expansion in bash to %%\.* to remove all the extra stuff.
New version seems to work alright so far. I hardcoded my mouse device this time.