Two Bone IK Constraint is extremely imprecise

Unity Engine
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1

Hello.

When using the Two-Bone IK Constraint, the transform of the tip bone is never aligned to the actual position of the target. Plus, moving the hint around changes the position of the tip.

I can “fix” it by rapidly clicking on the “Apply Root Motion” option on the animator, or rapidly enabling/disabling the animator. It appears the constraint isn’t getting enough solver iterations per update or something. I haven’t found a workaround. Any insight would be appreciated.

anim-rigging-bug

Using Unity 2021.3.45f1
Animation Rigging 1.1.1

2

I spent some more time investigating, and it turns out Animation Rigging doesn’t play well when an armature is scaled non-uniformly. I reset the torso and bicep scaling to 1,1,1 and the hand is now precisely following the target.