Painter 2020 Tools doesn't work in Big Sur 11.0.1

With any tool selected I'm stuck with the arrow instead of the brush selected or other tools. The same with Corel Painter 2019.

I am aware that the painter team just announced Corel painter 2021 Big Sur compatibility, but I can't afford it.

I need to know if someday has the same Big Sur / Corel Painter 2020 issue, please, 

and if there is a trick to avoid the issue.