Detecting if joint is covered up using XR Hands

I am using Meta Quest 2 headset to track my hands with XR Hands 1.4.1 package. Is it possible to get indexes of joints that are currently unavailable for tracking (due to partially covered hands, hardware on hands, etc.)?
I tried using XRHandJoint.TryGetPose() but after initial hand detection it always returns true with a Pose containing predicted position and rotation (or identity Pose filled with 0s if whole hand tracking is lost). My plan was to detect currently covered up joint and do predictions using other joint positions manually. I know there exists events that can be subcribed to when whole hand tracking is lost, is there something similar for specific joints? Any suggestions are appreciated.