Hi, @freyalupen and @sooz!
Thanks a lot for your testing! It looks like @freyalupen has found a real bug. I have just pushed a fix into my branch.
If you want to test again, here is a package for Linux. Though it is not strictly necessary now ![]()
Linux AppImage X64: krita-5.2.0-prealpha-c2669a36c24-x86_64.appimage — Яндекс.Диск
My current plan is to devote a bit of time to documentation, so there might be no updates in the next couple of weeks. And then I’ll return to porting the rest of the brush engines.