Ugee M708 with Debian 12 (Sparky Linux)

[DietmarSchuetz]

Dear all,
I was able to get the tablett running but the 8 buttons are not usable with Gimp 2.10
The table is shown as:
UGTABLET M708 Mouse touch id: 10 type: TOUCH
UGTABLET M708 Pen stylus id: 11 type: STYLUS
UGTABLET M708 Pen eraser id: 18 type: ERASER

With KDE System Set up, I can configure the tablett. Also be define the action for the buttons.
But using Gimp, Pen is working, also in combination with the keybord. But the 8 buttons on tablett himself are not working
How can I solve this issue?
Thanks for short response.
Best regards
DIetmar