Minecraft wiki entry for Development_versions, associated text: MC-8186 – Scoreboard vanishes when changing dimensions.
MC-8189 – Right-clicking with a helmet in hand crashes the game.
MC-8222 – Dispenser will put on stacks of armor.
MC-8277 – Scoreboard system doesn't accept @a.
MC-8389 – Giant Mushrooms still grow instantly from bonemeal.
MC-8416 – Furnace Minecarts drop a minecart and TNT.