Dragging prevents QML animations from updating

The following example is reproducible on both N900 and my desktop linux box.
To reproduce, simply drag the red square continuously over the white rotating block.
This should not affect the rotating block, but instead all paint updates apart from the
dragged rect are being ignored.

import Qt 4.6
import "content"

Rectangle {
id: screen
width: 800; height: 480
color: "black"
Rectangle {
color:"white"
width:500
height:600
transform: Rotation {
origin.x: 429;
origin.y: 410;
angle: SequentialAnimation {
running: true
repeat: true
NumberAnimation

{ from:0; to: 360; duration: 50000 }

}}
smooth:true
radius:4
}
Rectangle {
id:widget1
color: "red"
width:240
height:200
MouseRegion

{ anchors.fill: parent; drag.target: widget1; drag.axis: "XandYAxis"; drag.minimumX: 0; drag.maximumX: screen.width; drag.minimumY: 0; drag.maximumY: screen.height; }

}
}