TransparentTintBackdrop System.InvalidCastException: 'Specified cast is not valid.'

[ghost1372]

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>();

[AlexanderBlackman]

I got this problem too.

Here are the new Microsoft.UI.Composition apis added in 17-ex2

CompositionNotificationDeferral
CompositionProjectedShadow
    MaxOpacity
    MinOpacity
    OpacityFalloff

CompositionProjectedShadowCaster
    AncestorClip
    Mask

CompositionProjectedShadowDrawOrder
CompositionProjectedShadowReceiver
    DrawOrder
    Mask

[dotMorten]

IMHO this is a regression in EXP2, and I'd encourage you to report it in their repo.