SUMMARY
When scrolling speed is reduced to a value less than the default, mouse wheel movements will generate inconsistent wl_pointer axis events for Wayland clients.

This seems to affect scrolling in WezTerm, Qt5/6/GTK3 list views, Firefox (Wayland), and Chromium tab strip. 

STEPS TO REPRODUCE
1. Reset the "scrolling speed" of the current mouse to its default (5th tick on the slider)
2. Start wev from a terminal, move the wheel while hovering the window, and observe the output.
3. Reduce the scrolling speed
4. Repeat step 2

OBSERVED RESULT
When the scrolling speed is at its default value, wl_pointer axis events with the following values can be observed:
15, 15, 15, 15, ...

When it is lower than the default, one of the following repeat sequences can be seen (x = empty frame):
- x, 22, 11, ...
- x, 15, ...
- x, x, x, 18, x, x, 13, x, x, 13, ...
- x (repeat 9 times), 15, ...

EXPECTED RESULT
I'm not sure what the expected (correct) outcome should be, but I guess every wheel movement should generate an axis event with the same value.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.106.0
Qt Version: 5.15.9
Kernel Version: 6.3.5-arch1-1 (64-bit)
Graphics Platform: Wayland