When using setVehiclePos if you teleport it somewhere within the players simulated radius it will not teleport to that location but instead reload the vehicle in the exact position it was in.

It considered it successful and kicks you out of the seat.

Code I'm using:

function onCustomCommand(full_message, user_peer_id, is_admin, is_auth, command, arg1, arg2, arg3, arg4)
	if command == "?repair" and is_auth then
		local character_id = server.getPlayerCharacterID(user_peer_id)
		local vehicle_id = server.getCharacterVehicle(character_id)
		server.resetVehicleState(vehicle_id)
	elseif command == "?spawn" and is_auth then
		local pos = server.getPlayerPos(user_peer_id)
		for i = 1, arg2 do 
			server.spawnEquipment(pos, arg1, arg3, arg3)
		end
	elseif command == "?teleport" and is_auth then
		local character_id = server.getPlayerCharacterID(user_peer_id)
		local vehicle_id = server.getCharacterVehicle(character_id)
		local pos = matrix.translation(arg1, arg2, arg3)
		if vehicle_id == 0 then
			server.setPlayerPos(user_peer_id, pos)
		else
			local success = server.setVehiclePos(vehicle_id, pos)
			server.announce("test", success and "Successful" or "Unsuccessful")
		end
	end
end

This also appears to affect the setGroupPos function but when the vehicle enters simulation radius it teleports back to its original position before the teleport.

Vehicle is a compact pilot seat on a block and the command is ran while player is seated.