This has never happened before until my Minecraft decided to update to the newest version, 1.16.100. First it happened to my horse, I was still riding him and it was getting dark so I decided to go to bed. Clicking the bed while still on the horse, he then disappeared. Thinking nothing of it at first until it then happened to my cat. I broke the bed to move it while he was sitting on it and he too disappeared. But I could still hear him, as if he were only invisible. Then about 30 minutes later I was in a boat with my dog. I broke the boat with him still in it and my dog disappeared. But I could see him still swimming, like the bubbles they make in the water. I could hear him, he would still attack other mobs I hit, and he just gets in the way of building. Without being able to interact with any of them I decided to report this since it is starting to get some what frustrating.