AddAction/RemoveAction interferes with DisplayObject sharing

Steps to reproduce:
1. Compile and run:

<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark">
<s:states>
<s:State name="notOver" />
<s:State name="over" />
</s:states>

<s:transitions>
<s:Transition fromState="over" toState="notOver">
<s:RemoveAction targets="

{[rect1]}"/>
</s:Transition>
<s:Transition fromState="notOver" toState="over">
<s:AddAction targets="{[rect1]}

"/>
</s:Transition>
</s:transitions>

<s:Group mouseOver="currentState = 'over'"
mouseOut="currentState = 'notOver'"
x="100" y="100" width="100" height="100">

<s:Rect width="50" height="100" alpha="1">
<s:fill>
<s:SolidColor color="green" />
</s:fill>
</s:Rect>

<s:Rect x="50" width="50" height="100" alpha="0.9">
<s:fill>
<s:SolidColor color="green" />
</s:fill>
</s:Rect>

<s:Rect id="rect1" top="10" left="10" right="10" bottom="10" excludeFrom="notOver" >
<s:fill>
<s:SolidColor color="red" />
</s:fill>
</s:Rect>
</s:Group>

</s:Application>

2. Mouse over the graphic
3. Mouse out of the graphic
4. Mouse over the graphic

Actual Results:

The second green Rect disappears.
After the second mouseover the red Rect is now underneath the green Rect

Expected Results:

The second green Rect shouldn't disappear.
The red Rect should remain on top

Workaround (if any):

Set depth="1" for the rectangles, this effectively turns off displyaObject sharing.
Or alternatively
Set alpha="0.99" on the first green Rect (that way the first Rect has it's own DisplayObject and doesn't share the Group's DisplayObject)