I noticed that random circular patterns often appear inside a path that has cubic Bezier curves and stroke with dashes.
Sometimes these circles are empty, sometimes just look incorrect.

Changing TessellationMaxPixelError from HighQuality to anything else fixes the example I provided, but I haven't checked thoroughly for other cases. So it looks like some kind of numerical instability in certain conditions.

While I cannot say that this is a major issue, it is quite noticeable in some cases.