In this example file I have 4 bones: arm, hand, stick and root. Vector layer "v" is bent to hand bone.
In frame zero hand is parented by arm and other bones have no parents.
In frame 1 parenting is animated, so hand is parented by stick and stick is parented by root. So we have two keys for parenting: for hand and for stick. And now vector layer's position is wrong. Deleting any one of these two keys results in correct position. But two keys make it wrong.
Bone reparenting breaks child layer's transform calculation
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