Using Krita version 3.11.88 on Windows 10 with new Surface Pro 4. When I turn the Surface stylus over to the eraser side, the tool switches to the eraser but when I flip the stylus back to the tip, the tool stays on the eraser. Pressure sensitivity still works. I can manually select a regular brush tool to get it back to drawing but as soon as I flip the pen, it gets stuck back on the eraser function.
*** This bug has been marked as a duplicate of bug 375878 ***