I had tamed a horse and then used a name tag on it as well as putting a saddle and diamond horse armor on it. I took it up to my house and put it inside my house because I wasn’t finished building a stable. I put the horse inside a room and then blocked off the room so that the horse had no exits. He was with one other horse who I had tamed a long time ago. I’m not sure of the time frame but I’d say 10-30 minutes later my friend(the host) logged off the world. I got him to reload the world and got back on the world as soon as it reloaded. I hadn’t checked on my horse since I put him in the room, and it wasn’t until an hour or so later that I checked and he was gone. My friend couldn’t have stolen him because he was afk the entire time. I don’t think the horse suffocated because I should’ve seen it in chat. I think the horse wasn’t saved when my friend logged off, but if that were the case I should’ve had the horse armor back and kept the name tag. I’ve checked every chest and my ender chest for the armor to no avail. I’ve been having other issues with horses but this is the worst one by far.