I believe I’ve found an issue in network ownership and seat animations in regards to seats welded to parts that are held together by welds and hinges.
A client will enter a seat, welded to hinged part and will get their sitting animations; however the server, and other clients will not see that sitting animation.
However; when another client enters that vehicle to drive it and takes network ownership; the sitting animation is updated to be viewed on that client who has control over the entire vehicle.
But if the client in the hinged seat were to get out and then get back in to the hinged seat whilst the vehicle is under network ownership of the driver, the seat animation will no longer work for that client only.