Odd QDial behaviour with inverted appearance

When creating a dial with the data range from e.g. -20 to 20 and setting the invertedAppearance to true, the behaviour and look of the dial becomes quite odd.

One thing is, that the dial itself does not look "mirrored" correctly. It looks like the dial is rotated . (maximum value is exactly at "north" position).

Another issue is, that setting the current value using the mouse cannot be done correctly anymore. For the given example (-20 to 20), the value can just be set in a range from 0 to 20 using the mouse.