Minecraft wiki entry for Development_versions, associated text: MC-2255 – Redstone wire uses different criteria for connecting visually and logically.
MC-8645 – Redstone wire receiving level 1 power from a block, pointing at another block with wire on it will not power that block.
MC-9405 – Top piece of staircase redstone dust doesn't power blocks on the same height in the direction it is powered from unless only connected to something on the other side.
MC-11211 – Unable to perform many right-click actions when targeting the top face of blocks placed at y=255.
MC-13727 – Arrows shot from bow bounce on horse when moving or not and damage if fire arrows.
MC-105132 – Horse, spider and llama spin around when walking next to the fence or wall.
MC-111381 – Rendering rotations for shulkers are set in onInitialSpawn method.
MC-117806 – Dispenser with a filled bucket at y=255 facing upwards replaces filled with empty bucket despite no fluid being placed.
MC-127149 – Land mobs cannot properly walk on the waterlogged blocks.
MC-131634 – Getting burnt if on top of non-full block.
MC-137336 – Redstone dust's hitbox is inconsistent with other blocks when branching.
MC-143904 – Adding a non-rail block to the #rails block tag will crash the game when placing a minecart on it.
MC-147255 – Beds in the Overworld will explode if in a nether wastes biome.
MC-153508 – Redstone dust traveling up the side of a block cannot be targeted.
MC-155742 – Iron golems tend to congregate on the north side of villages.
MC-162385 – The background of /title text does not fade with the text.
MC-166269 – Wet wolves become black for an instant after shaking off water.
MC-166296 – Mobs picking up and equipping items does not play the equipping sound.
MC-166895 – Underlines in Written Book Text disappear with subtitles.