Bug Hunting: Shadowed 3D and ScrollRect

I don’t discover as many bugs nowadays as I’ve used to in the old days when I was beta testing for Macromedia. But it happened today, and I’ve just installed the newest Flash Player 10.0.22.87 to be sure. It happens to DisplayObjects A inside DisplayObjectContainers B inside DisplayObjectContainer C, when

• A was not initially visible (not inside initial scroll rect of C)
• A is in 3D mode (I just change rotationY for that)
• B is in «cached as Bitmap» (cacheAsBitmap would do, I go with DropShadowFilter in the example)
• C’s scrollrect property is set, so A is shows up (well, it doesn’t – that’s the bug after all ;) Here the example:

bug-3d-shadow.swf And here the code:

/* Flash Bug - Flash Player 10.0.22.87
    disappearance when 3d's parent has shadow
    more info: betabong@gmail.com
*/

this.stage.scaleMode = StageScaleMode.NO_SCALE;
this.stage.align = StageAlign.TOP_LEFT;


var scroller:Sprite = new Sprite();
addChild( scroller );
scroller = this;

var filter:DropShadowFilter = new DropShadowFilter( 2 , 90 , 0 , 0.5 , 8 , 8 , 1 , 2 );
var r:Sprite,rect:Sprite;

for ( var mode:int = 0 ; mode<=1 ; mode++ ) {
    for ( var i:int=0 ; i<3000 ; i+=100 ) {
        r = new Sprite();
        r.addChild( rect = new Sprite() );
        rect.graphics.beginFill( 0xff0000 );
        rect.graphics.drawRect( -40 , -40 , 80 , 80 );
        rect.graphics.endFill();
        rect.addEventListener( MouseEvent.MOUSE_MOVE , rotate );
        if ( !mode ) r.cacheAsBitmap = true; //r.filters = [ filter ];
        r.y = i + 100;
        r.x = mode * 150 + 100;
        addChild( r );
    }
}

stage.addEventListener( Event.ENTER_FRAME , move );

var scroll:Number = 0;
function move( event:Event ) : void {
    scroll += ( stage.mouseY - 100 ) / 50;
    scroller.scrollRect = new Rectangle( 0 , scroll , 500 , 200 );
}


function rotate(e:*) {
    e.target.rotationY++;
}

Update: Now that: it took me about 20 min to file a bug in the Adobe Bug System (which is slow as hell anyway). And when I want to submit it, I get a message saying they’d be in maintenance. Well, buggy bug systems piss me off quite a bit.