I'm not sure if it's only the oak boats but at the most random times, i will get off a boat and my boat and everything in it will disappear. I lost a horse, diamond armor, and saddle because i got out and it just disappeared. I have a video i will attach of my girlfriend in the oak i just got out of. I'm assuming when i get out it teleports the boat but I'm not sure because on her screen she's not moving