I don’t have any issue on the file on my side
Only the canvas is impacted?
If you use the pen outside (menu, docker, even on “paint” for example) everything is fine?
Does the problem occurs when using the mouse to draw too?
I’m wondering if it could be related to drivers…
What’s your current Krita configuration settings (Display > Canvas acceleration)?
Does the problem still occurs if activate/deactivate canvas acceleration, or change the settings?
Grum999