Minecraft wiki entry for Development_versions, associated text: MC-19413 – Horses try to "finish" pathfinding when interrupted by a player riding it.
MC-33285 – Summoning slimes with custom maxHealth attributes does not work.
MC-83003 – Barrier particles are not visible if the barrier block is in the off-hand.
MC-83051 – Spectral arrows, potion arrows, and Channeling tridents apply effects to endermen.
MC-94421 – Shooting an enderman with a bow and arrow or trident will play arrow or trident collision sounds and subtitles.
MC-94491 – Pressing Esc in world settings returns to the main menu instead of the world list.
MC-112850 – Items with an empty AttributeModifier tag spam the console.
MC-122135 – Several GUIs are not closed when pressing Esc.
MC-124280 – Using fire charges on TNT in Creative mode consumes the fire charge.
MC-129781 – A trident will hit the ground after hitting an enderman.
MC-133348 – Wrong position of elder guardian effect while swimming.
MC-140825 – Structure palette variant selection looks faulty.
MC-144608 – Reloading a shader with modified vert/frag files will not update it.
MC-147865 – The elder guardian particle is displayed too high, over the player's head.
MC-149928 – Soul sand can not suffocate mobs.
MC-155591 – Foxes can spawn in the giant spruce taiga, but not in the giant tree taiga.
MC-157212 – Trusted fox hostile AI seems to be broken; foxes only defend players from mobs that shoot arrows, but ignore mobs that use melee attacks or projectile entities that are not arrows.
MC-162531 – The player sneaks while sleeping if there is a lantern two blocks above the bed.
MC-166590 – Sweet berry bushes do not generate in any type of giant tree taiga biomes.