Minecraft wiki entry for Development_versions, associated text: MC-137467 – Ender dragon does not spawn if render distance is set to 10 or below.
MC-138572 – Can't place bells and lanterns on top of some non-solid blocks.
MC-139376 – Crash when putting spaces and clicking on "Done" in the jigsaw GUI.
MC-139798 – Bad omen disappears upon entering villages in spectator mode.
MC-140055 – After leaving the bed, the player can spawn inside of scaffolding.
MC-141009 – Clicking "done" on a Jigsaw disconnects client on dedicated server.
MC-141358 – Tridents have the SoundEvent tag, but don't use it.
MC-145758 – Villagers constantly breeding but don't produce baby villagers.
MC-146282 – Entering command block UI causes all music to stop.
MC-146346 – Backup world file saved without .zip.
MC-146350 – Splash water bottles do not put out fires.
MC-146454 – Eating food no longer plays the burp sound.
MC-146594 – Villager babies don't have biome-specific skin.