TransparentTintBackdrop is working fine in v1.7-EXP1 however it is not working with v1.7-EXP2 and get an exception ` System.InvalidCastException: 'Specified cast is not valid.'` ``` protected override void OnTargetConnected(ICompositionSupportsSystemBackdrop connectedTarget, XamlRoot xamlRoot) { var inspectable = connectedTarget.As<IInspectable>(); ```