QColorDialog - hue selection is wrong

As you will see on the attached screenshot the painting of the hue selection (left side) is incomplete/wrong. On the example it goes from red to magenta, to blue, to cyan and then to green - the bands green to yellow and yellow back to red are missing. The selection seems to be working fine (you can select any hue as long as you ignore what you see).

On the example I selected an orange (right side) by clicking the green (on left)