when you get close to an entity such as an item, mob, ect. they will disappear. for mobs you cant hit them but the can hit you. for items you cant pick them up. which just ruins the game and you also cannot pick up tridents, arrows, and leads. my pics are cave spiders in a 2 block high cage as i get on the red blocks (aka 2 block away point) they disapper i cant record youtube videos for my channel with Minecraft acting like this