Cleaning banners in Creative does not lower cauldron water level and gives an extra banner

What I expected to happen was...:
Clears the latest added Dyed part

What actually happened was...:
Cleared the latest part but I kept the part I already have, meaning I now have two banners

Steps to Reproduce:
1. Dye a Banner
2. Right clicking a cauldron (filled with water) with a dyed Banner to wash it.
3. You get given a cleaned banner, but the unwashed banner is still in your inventory

Fix would be to "remove" the original when giving a cleaned version of the banner