I've had this problem too, when trying to transport foxes through a nether portal. They disappeared, then reappeared after I quit the game completely and restarted, but now as soon as I open the game it crashes.
Robin LaGrone
I've had this problem too, when trying to transport foxes through a nether portal. They disappeared, then reappeared after I quit the game completely and restarted, but now as soon as I open the game it crashes.