Problems With The Shields

These aren't really bugs, but there are problems with the new shields.

I went in a creative singleplayer map in flatland, and I checked how a shield would do with diamond armor while attacking a large slime, and expected losing about 3 hearts and shield durability at green.

So, I actually lost half 1 heart and the durability hit the oranges.

Since these aren't bugs, you can't reproduce them, besides getting a shield, and full diamond armor.