The buttons on the Huion pen PW500 don't work when they are mapped to mouse clicks. The cursor moves. The brush outline stays stuck and no action is invoked. The button of the pen still works on dockers, other programs, and on the OS in general.
The only way to get it working is incomplete: you need Krita to lose focus, then press the pen button over the canvas to make it recognize the click.

This is especially bothersome when you are used to navigating through this click instead of the space bar + left click combo.

The tablet is a Huion Inspiroy WH 1409 v2 (I believe Deevad has a v1)

STEPS TO REPRODUCE
1. open a document in Krita
2. use a button mapped as a click on the canvas

OBSERVED RESULT
The cursor moves, but not the brush outline (as if painting on a locked or group layer)

EXPECTED RESULT
Easy life

SOFTWARE/OS VERSIONS
macOS: 11.2.2 (20D80)

ADDITIONAL INFORMATION
I cut my thumb tip yesterday, it's uncomfortable to draw :'(