Reposted/remade from a closed canny since the issue was still was not fixed.
Avatar 3.0 avatars (and 2.0 avatars, but less visible) will move from their origin position forwards before returning to their normal position when they do an emote. This was tested with my personal avatar and the VKet-chan sample avatar.
World used is Just Sanmenzu, but it can be easily visible outside of the mirror/sideview camera because the neckless body will appear for half a second.

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