> I was thinking about this because I think I've bumped into this before... So, I don't think it's a bug. If it is a bug, it's always existed... I think.

Either way, the issue seems to be that `Angle jitter` on a brush does weird things to anti-aliasing. Occasionally anti-aliasing disappears completely and generally just looks terrible. 

I had a moment of clarity and I realized that if I start with a rectangle with straight angles, the brush engine <sup><sub>(or whatever)</sub></sup> has to figure out the anti-aliasing and it seems like it is pretty much botching it. So I got an idea... what if you start with anti-aliasing?

I rotated my square 45 degrees before making it a brush and that seems to have given me a pretty good result. The straight angle square looks terrible in comparison.

**So I think in this specific scenario at least, fix is to include anti-aliasing in the source image.**

> I also tested a blurred square with a smaller brush size and that seemed to work better than no anti-aliasing, but it still failed quite badly in smaller sizes.

With 100% zoom:

[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/SetSP.png