When I /give or /replaceitem in the inventory, it causes hotbar scroll lag. On a realm I made inventory GUI but only issue is every time the item is replaced via /replace item in to any of the inventory slots, it causes the scroll marker in my hotbar when scrolling to go back to to the postion it was before the execution of the /replaceitem. Also /give does the same if the item goes in the inventory. Does not happen in any other slot type to my knowledge.