@ManInCool Thank you for your clarification! I have shared this issue within the Spine team, and we are in agreement that it would be a good idea to make some improvements, but we are still investigating and considering what is the best solution for this. I'll reply to this thread when there is any progress on this!

Ahhhh, I think I understand the cause of the confusion. My video showed "copying the bone transform", but what ManInCool was trying in the GIFs is "copying the translate key". If you copy the bone transforms, they will be correctly pasted in absolute position according to the World axis, even if the parent bone moves.

@ManInCool Could you please try to press Ctrl+C after selecting the bone name on the Tree view, and paste it to another frame?
Since keys store the difference of the position relative to the position of the bone in the setup pose, it is correct behavior not to move to the absolute position even if the World axis is selected when pasting it.

@SilverStraw I got this idea from the project you attached. Thank you!