Client can't see cobble generating from water and lava

When playing multiplayer if I create a cobblestone generator the client won't see the cobble stone generating instead it will see NOTHING. It can also pass through that place where the cobble block is supposed to be but it instantly takes damage by the invisible block. Host can see everything correctly. You can see from the attachment the clients view. There is no cobblestone generating when it really is from hosts view.