Minecraft wiki entry for Development_versions, associated text: MC-16883 – Villagers play the trade sound multiple times overlapping on shift-click.
MC-88301 – Ender Dragon Breath freezes server when under or above the world
MC-90423 – Ender Dragon makes breath attack at highest block placed in the center column of the portal.
MC-140174 – No item pickup sound when a villager picks up an item.