Using Path inside SparkSkin results in component creation failure

Steps to reproduce:
Just run or debug attached project, there are only one spark button with it's skin class and application_creationCompleteHandler (should show alert when created)

Actual Results:
FlexEvent.CREATION_COMPLETE is never dispatched, so we don't see the Alert.

Expected Results:
Handler gets executed and Alert is shown.

Workaround (if any):
Don't use the following code inside s:SparkSkin with hostComponent s:Button:

<s:Path id="innerTL">
<s:data>
L 0

</s:data>
<s:stroke>
<s:SolidColorStroke/>
</s:stroke>
</s:Path>

However, if you change path data argument from "L" to "M" or don't bind its coords to innerTL everything works fine.