Minecraft wiki entry for Development_versions, associated text: MC-13599 – Leash and hay bale do not have a name.
MC-13601 – When going fullscreen, character looks up into the sky and spins around quickly.
MC-13610 – Players do not activate stone pressure plates anymore.
MC-13623 – Nullpointer exception when entering boat/minecart/riding horse.
MC-13625 – Color of the experience bar while having spawn eggs, enchantment bottles, enchanted books and nether stars in the inventory.
MC-13627 – When killing a horse you will get a normal saddle back.
MC-13628 – SMP/LAN: NPE when right clicking horses.
MC-13638 – Boats do not work in 13w16a.
MC-13660 – Mobs become stuck on carpet.
MC-13929 – Mouse cursor no longer snaps back to center of window after exiting inventories/menus.
MC-14321 – Carpets obstruct bed spawns / stuck in ceiling after leaving bed.