Minecraft wiki entry for Development_versions, associated text: MC-2518 – No breaking sound or particle effect for some tools and all armor.
MC-4732 – Tools and weapons lose durability when attacking players that are in Creative.
MC-10369 – Server side particle spawning does not create particles for client.
MC-66206 – Beacon color change delayed if the beam passes through water, cobweb, leaves.
MC-88176 – Entities standing on Y=63 will become invisible when looking up.
MC-90594 – Player can stop sneaking/gliding without space to stand up.
MC-101567 – Point of vision can become unsynced with player model (Elytra)
MC-102055 – Wither skeleton waving arms in the water when targeting a player.
MC-110066 – Bat hitbox jitter when it is upside down under the block.
MC-113898 – Water below lily pads is replaced by wooden planks village paths.
MC-118238 – Torches can be placed on top of glass, but not on side.
MC-119136 – Some mobs skin repetitively change.
MC-121105 – Beacon beam color update is slow when too far away from the beacon block.
MC-121148 – Polar bears are required in "Monster Hunter" advancement, but are not completely hostile.
MC-125774 – The player keeps its 1 block height of swimming animation when going out of water.
MC-127238 – Beacon colors don't update as frequently anymore.
MC-129863 – "Crawling" underneath glass/grass paths/other transparent blocks causes bugs.
MC-130572 – Using an ender pearl to teleport into a one-block-high area with water in it will cause the player's head to become stuck in a block.
MC-131116 – Re-entering water while in a crawling state can cause the player to visually stand up.
MC-132482 – The player's swimming state is not saved, which can cause suffocation and potential loss of items.
MC-132816 – Using lava bucket on kelp and seagrass empties bucket without placing lava.
MC-133042 – Block of grass that grew from dirt under snow is not snowy.
MC-133844 – Visual glitch with 1 block tall area (Character standing in blocks).
MC-135501 – Invalid block/item tag inside another tag file causes the game to crash.
MC-136869 – TNT falling through slabs when ignited it.
MC-137162 – Debug profiler results confuses milliseconds and nanoseconds.
MC-138486 – When a player fall to the void the player is bugged.
MC-146863 – Shakespearean English's name occludes its own selection box.