Inventories Broke

When making a custom entity if you give them the container type
"minecart_hopper" or "minecart_chest" the inventory will be very buggy, the item you place in the slot will also be placed in the slot left of it, a "ghost" item you can call it. When attempting to take the "ghost" item out it will not be put in the players inventory, it will stay there until you close the UI.