When In split screen, second player can’t mine a block and get the entity for it. As well as the first person seeing the block that is mine. Second players mines a block and first player still sees that block as a physical and seeable block. Like second person didn’t mine it at all. 

online multiplayer, no one can join my world anymore. Even both players in beta. Last update bugged it all. Can’t join any world that aren’t mine or have anyone join my worlds.