Renaming items with anvil is case insensitive

When you rename an item like a map to "vergilbte Karte" and then place it again in the anvil UI to change the name to "Vergilbte Karte" it does not recognize a change and you cant take it out with the new name. You need to change other letters first, take it out and place it in the anvil UI again to be able to change the case of the letters (upper/lower).