In 83.9 when you go to change the brush shape with TAB and you have it at a different size it will go back to the default brush size. I'm not exactly sure if this is a bug or not but i thought i would point it out.
Or the bug thread. But actually, this isn't a bug, according to Simon. He says he likes it better this way. Some other people agreed I think. If everyone complains that they like the old way better, he will probably change it back, or i'll just do it and see if he takes the commit.
I don't really use the other brushes, but the old way does seem better.