Hi, I have come to report a bug that I found in minecraft 21w20a (I don't know if this happens in minecraft 1.16.5) but hey, I'll explain

The bug consists of grabbing an item from the creative's inventory and closing the inventory, the item will remain in the inventory but as a ghost item, but then if you open the inventory again, grab the item and leave it as it should, then the bug will be fixed.