I've recently encountered a bug where you can dematerialise your (synced) Tardis if you right click a demat lever placed by someone else in the Overworld.Fortunately I was able to summon it back using a Tardis key

Previously this didn't happen as the server gave the message "This is not your Tardis". I found this by using the demat lever in the Tardis servicing spot opposite the Tardis impound centre.

same here i left my tardis because i spawned in the spawn tree and thern i got a key from a friend and the it sayd this is not ur tardis now i need a new tardis pls help swd