enum TrackingStateReason
(Niantic.Lightship.AR.XRSubsystems.TrackingStateReason)
Provides further information about the tracking state of an anchor. Query this if the anchor's tracking state is NotTracking
enum TrackingStateReason: UInt32 {
	    None             = 0,
	    Removed          = 1,
	    AnchorTooFar     = 2,
	    PermissionDenied = 3,
};