In multiplayer when a player joins another world trying to put a block that is not in the first inventory space is changed and becomes siemrpe the item you have in the first frame inventory for example if I have a torch in the Stock first frame and the second block of wood to place the block of wood is placed torch instead of the wooden block and the player who owns the world always sees the other player with the first item of inventory on hand never changes at least the first item to have on hand is changed