I was transporting a cat across an ocean, and when I hopped out of my boat to get on land, the boat disappeared and my cat was glitching over the ocean. It was disappearing and reappearing and it would bounce from where the boat disappeared all the way back to the middle of the ocean I travelled across, then back to where the boat was. I left render distance to sleep in my bed and when I returned to see if I could fix the issue the boat was back with my cat in it again.