How to rotate mask around cursor? I want to animate mask (half circle) in image editor - rotate mask around cursor placed in a center, but final animation looks strange. 



Does it current limitation of masks's keyframe or is there anything that I can do better to create simple rotation?

(I tried to ad last anchor point of previous circle in a hope it will be calculated as circle shape, but same result.)

Thank you
As pointed out by @RayMairlot you can rotate the mask in the compositor by addong a rotate node and animating its values: