Invisible Mobs

I was playing a multiplayer, offline world with a friend on my Xbox One with the new update and discovered that I had some invisible mobs attacking me. I also noticed that I was unable to defend myself against the mob as it had no hitbox. It was a zombie in this instance in particular, it was invisible, and did not have a hitbox. I also discovered most aggressive mobs disappeared and reappeared around randomly. It was almost impossible to chase them down or defend myself since they kept disappearing right before I was able to hit them and then they would reappear somewhere else and start attacking me again. It made it very hard to play as I kept dying because I was unable to defend myself.