Yeah, Zbrush has a lot of this bugs. Specially regarding to 2.5D tools and operations. I know this very well, because I used Zbrush a lot as a 2.5D illustration tool until version 3.1. From 3.5 and above, they messed up 2.5 brushes, and a lot of things that worked properly no longer works. Even on sculpting, Zbrush has a…