Vision Framework rightLeg detecting incorrectly

This sounds insane, but I'm unable to detect the right leg with the vision framework.

Code Block 
import Vision
let rightLeg = try observation.recognizedPoints(.rightLeg)
      print(rightLeg)

The result is:

Code Block 
[C.VNHumanBodyPoseObservationJointName(_rawValue: left_foot_joint): [0.000000; 1.000000], C.VNHumanBodyPoseObservationJointName(_rawValue: left_leg_joint): [0.751968; 0.281050], __C.VNHumanBodyPoseObservationJointName(_rawValue: left_upLeg_joint): [0.767090; 0.715324]]

As you can see, it seems to be tracking the left leg. This is similar to the result if I change the groupName value to .leftLeg.

.leftArm & .rightArm work as expected as well. Only .rightLeg is not working.

I've tested detection on several people with the same results.

How is this possible?