There is an error where the item is not visible in the hot bar or in the inventory.

There is an error where the item is not visible in the hot bar or in the inventory, only the number is displayed. If you press the Q key, the item will be discarded normally, but if you pick it up again, it will not be visible. There are only 3 worlds and all of them are less than 1MB and I don't know why this bug occurred. I hope you can fix it as soon as possible.