Mobile, Android: Pinch-Zoom in Air Mobile not functioning if used on a vertical

Steps to reproduce:
On Android ( tested on GALAXY Tab 10.1 )
1. Make sure: Multitouch.inputMode = MultitouchInputMode.GESTURE is set.
2. Handle TransformGestureEvent.GESTURE_ZOOM events on a component.
3. Try to use zoom gesture.

Actual Results:

If you align your fingers in a vertical line and pinch zoom, no gesture is detected. At any other angle gesture works fine.

Expected Results:

User should be able to pinch zoom on a vertical line.

Workaround (if any):

None