I had this issue long back, when my wacom ctl-6100 was far exceeding my 4k display. But then it got fixed automatically with some software upgrade in Debian 11 bullseye.
But recently, I plugged it in again to sign a few documents and found that the problem has reappeared. Can someone guide me how to diagnose, where the problem is? Here is what I did, Since Wayland is now default, xsetwacom doesn't show any device. Although the tablet works. To debug, I disabled Wayland in /etc/gdm3/daemon.conf and then tried to set Area parameter using xsetwacom. But it did not help. libwacom-list-local-devices command's output shows that the system is picking up /usr/share/libwacom/intuos-m-p3-android.tablet and setting Width=3 and Height=5. Ideally, it should pick /usr/share/libwacom/intuos-m-p3.tablet which has Width=9 and Height=5. BTW, libwacom-list-local-devices command works in Wayland as well. Any further clues would be great help. Regards Pankaj