Anchor Animation not working as expected

Used AnchorChanges and AnchorAnimation to specify a "fullscreen" state, in which the toolbar and statusbar go up (outside the screen). In the attached file, the "root" element represents our visible screen, the larger toplevel Item allow us to see the behaviour of the animations more clearly.

Click the rectangle to make the statusbar/titlebar animate up, wait it stops, then click again for animate down. I expected the toolbar and statusbar to animate together when going down, but the statusbar jumps directly to end position.

Note that if I click to animate up and click again during the animation, it animates both bars down as expected.

Tested with Qt revision 63e15bbb9666ab49305d45380f9f580fb0e168ca