Minecraft wiki entry for Development_versions, associated text: MC-4534 – Tool highlight shows when item stack changes.
MC-4537 – NullPointerException when nothing in their hand.
MC-4553 – zombies sometimes stop attacking.
MC-4580 – Unbreaking does not work on armor.
MC-4584 – Opening an GUI will show the item name in the hotbar again.
MC-4612 – Enchanted item bug in 3D.