OS: Windows 10
Adobe Illustrator 23.0.1

When creating dashed lines at small sizes, the lines are distorted. See attached image - weight is .1mm, dash size is .1mm. The line is perfectly straight, the profile is uniform and the "Preserve exact" option is enabled.

The type and amount of distortion seems to vary depending on the line's position in the document as well. Moving the pictured line 2 mm to the right means the distortion is suddenly vertical rather than horizontal.

This is of course not a major issue as long as the illustration is only meant to be viewed in its original size - but this defeats one of the purposes of using vectors, as the illustration should be scalable to any size without significant distortion.