If a property is being changed via a state change from a named state back to its default value, and if the value is being changed with a NumberAnimation, the property does not always properly revert to its original value if the animation is interrupted and restarted before the original value is reached.

In the attached code sample, the property being changed is anchors.leftMargin, but the bug's behavior holds true for any numeric property.

If you run the code and rapidly click on the blue button (interrupting the animation), the top rectangle will eventually stop returning to it's default state properly. The bottom rectangle always will. The top rectangle uses a State to change the value, where the bottom uses a ternary operator evaluation.