When renaming your item, it'll some reason try to prevent you from getting the renamed item. But if you shift-click the renamed item, then exit the inventory, that item will "duplicate" the number of items you've renamed in a stack (eg. renaming 32 charcoal to "Sample", shift-clicking the renamed charcoal, exit inventory, will give you 32 extra charcoal). However, you can 't interact with the renamed item, and when you open the inventory, your renamed item will disappear, leaving you with the duplicate, which is unnamed and can be interacted.