IOS 6: problem with sprites rotation in gpu mode

Question

Hi,
I have a game published on iTunes and today I found a serious problem with the latest iOS 6 GM.
Sprite rotation around X and Y axes doesn't work with gpu render mode.
Here is my code:
<mx:UIComponent id="gameCanvas" mouseChildren="false" mouseEnabled="false" width="100%" height="100%" />
var gridSprite:Sprite=new Sprite();
gameCanvas.addChildAt(gridSprite,0);
// then I draw stuff on this gridSprite
It works fine if this sprite is not rotated.
But when I change its rotationX or rotationY properties, the sprite disappears from the screen!
My game works fine on older versions of iOS (5.0, 5.1.1 and 6 beta 3).
This problem only happens on iOS 6 GM and since iOS 6 will be officially released in a few days, I am really worried...
I tried Air 3.3 and Air 3.4 - both have this problem.
In "cpu" and "direct" render modes sprite rotation works, but graphics performance is terrible. So "gpu" is my only option...
I'll really appreciate any help.

Answer 1

I performed some other tests and so it seems like everything is 2D in gpu mode. When I try to do 3D transformations, objects disappear from the view.
For example out of these 3 images only image1 is displayed:
<s:BitmapImage id="image1"  source="logo.png" height="25%" width="100%" />
<s:BitmapImage id="image2"  source="logo.png" height="25%" width="100%"  rotationY="5"/>
<s:BitmapImage id="image3"  source="logo.png" height="25%" width="100%"  z="5"/>
Maybe there is some setting that enables 3D (something like zBufferEnabled=true) that needs to be explicitly set for iOS 6 in gpu mode?
UPD: Ok, I'm pretty sure it's a bug, I reported it to Adobe - Bug 3330901