I was going about my own business in the hills with a horse that had a diamond armor and I got off the horse and the horse just disappeared when I got off of it. I've had other issues like I'm guiding a Llama with a lead, the lead breaks and when I start looking for the lead, nowhere to be found, and when I check the Llama also disappeared, I didn't hear the sound of it falling in a cave, it didn't go anywhere it just disappeared. I've had some really weird stuff happen with leads way to often and I haven't even played for that long, sometimes when I tie a horse to a fence the horse breaks the lead or I don't know and the lead nowhere to be found when the time for an item to despawn hasn't even passed.