[Scenario] Simultaneous Rotate3D on object and its descendant creates jerky animation as vanishing point moves suddenly

Steps to reproduce:
1. Compile and run attached MXML file, which has

• A group with a rect in it
• A Parallel with two overlapping Rotate3D effects - one on the group, one on the rect
  2. Click on the group

Actual Results:
Group rotates some, then the animation snaps to a new vanishing point and it rotates some more.

Expected Results:
The vanishing point should not snap just because I started another animation on another object. It should either stay the same or somehow be composited.

Workaround (if any):