[Bug] Seat bone bounces on player head

<img width="1910" height="966" alt="Image" src="https://github.com/user-attachments/assets/bc628f4b-7970-48c6-bc51-d026c8d3d542" />

Video: https://imgur.com/pCgIWCX

i tested it on 1 14 3 better model also, same bug on 1 14 2 

server version is 1 21 4 purpur