SUMMARY
First time reporting a bug. Sorry if I screw up.

This may be a problem with OpenTabletDriver, but this doesn't happen in hyprland, at least not, when the tablet isn't added in the config file's input settings and only OpenTabletDriver is used.

I have a problem with drawing tablets on KDE. Me and my friend tested this on multiple computers and a virtual machine, all of which were running Arch Linux.

The tests were done with the following environment.
- This was tested on an up-to-date Arch Linux install.
- This problem happens with both KDE Plasma 5 and KDE Plasma 6 RC 1.
- This only happens with 2 monitors. (Probably happens with 3+ monitors, but I haven't tested that.)
- This only happens with the wayland session.

When I have a tablet using OpenTabletDriver connected and the tablet is in artist mode, the tablet's cursor only moves in the right half of the selected display area. (Selected in OpenTabletDriver)
For example, when one monitor is selected, the cursor only moves in the right half of the monitor.
When both 1080p monitors are selected, the cursor only moves on the right monitor.

If i'd have to guess, this may have to do with the tablet being added as a drawing tablet in the input settings, which doesn't happen in the x11 session. When it's added as a drawing tablet, KDE assigns the tablet to a display.
The input settings and OpenTabletDriver may be fighting over the allotted display area. Not sure though.

STEPS TO REPRODUCE
1. Open KDE Plasma wayland session with 2 monitors connected.
2. Open OpenTabletDriver.
3. Set tablet to artist mode and apply.

OBSERVED RESULT
Tablet's cursor moves only on the right half of the selected display area.

EXPECTED RESULT
Tablet's cursor moving on the whole selected area.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.27.10
KDE Frameworks Version: 5.114.0
Qt Version: 5.15.12