Hello @bonkmaykrQ, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to https://github.com/ValveSoftware/Proton/issues/4322#issuecomment-730743386. Also, third party Proton builds can not be used with the whitelist.
Whitelist Request
System Information
I confirm:
Playbutton in the Steam client is sufficient.Issues
https://youtu.be/5fkBsW-zLXk