Individual joint tracking and visible flags - Quest 3 Full Body Tracking

Has anyone explored checking if individual joints are visible and when they might not be from the sensory data / OVRPlugin?

I'm trying to see on a per frame basis what joints are actually 'tracked' and 'visible' compared to which aren't in order to implement custom solutions IK / different tracking data. E.g. if joint isn't tracked, use this other sensor that has an estimate of it.

In the retargetting sample they use the headsets field of view to guess which points might be visible and blend it with IK but I'm trying to see if i can get it at the raw data level.

When looking at OVRPlugin, there are a few booleans like positionValid and positionTracked, but they always return True even in cases where I'm in say a T-Pose looking to my right, my left joints will show up as Valid and Tracked which can't be the case.