Zbrush r8P2 Wacom Intuos Pro Sensitivity Bug

Load up Zbrush. Open a dynamesh sphere project. Draw a mask on the sphere then undo. Repeat until you see the change in the mask stroke. This is the bug. Notice the mask “intensity“ becomes weaker and the brush size suddenly smaller. This is a bug with pressure sensitivity. It does not happen in photoshop, only Zbrush.