Many tools cause a diagonal stroke to appear
Since the 21.1 update, various tools seem to randomly get a stroke segment connecting back to one of the top corners of the monitor. This primarily happens when using my mouse, and when Smoothing for the Brush tool is set to 0%. I do not experience the bug when using my Intuos 1 stylus (with WinTab fix), or when Smoothing is set at least 1%. The bug still occurs with other tools such as the Lasso.