Minecraft Wiki:Parity issue list

General

 * Shared block spaces

World generation

 * Huge mushrooms generate naturally in swamps
 * Igloos have white, magenta and brown beds, rather than red, have polished diorite instead of polished andesite, and packed ice instead of ice

Blocks

 * Snow affected by gravity
 * Snow melts in snowless biomes
 * Doors can be waterlogged
 * Enchanting tables emit light level 12
 * Leaves have snowy texture when snowed on
 * Melon drops 9 slices when mined with shears
 * Pistons, droppers and dispensers don’t have Quasi-Connectivity
 * Piston head model has more accurate "neck"
 * Pistons require 1 tick to retract
 * Pistons take longer to extend
 * Pistons finish extending before retracting
 * Redstone dust power transmittion is in a random order
 * Un-connected redstone dust is a plus, rather than a dot
 * Redstone dust connects to pistons
 * Glass panes and iron bars have 3D item model
 * Beds have 2D item model
 * Cauldrons can hold lava
 * Water can be colored
 * Blocks that contain block entities can be pushed/pulled with slime blocks and pistons

Items

 * Potion of decay
 * Book and quill and written book have 2 pages open at once
 * Fishing can give bamboo
 * Boats can smelt 6 items in furnaces
 * Bucket of tropical fish is named "Bucket of tropical fish name"
 * Maps show player heads instead of arrows

Entities

 * Parrots can dance on a player's shoulder
 * Spiders can spawn on leaves
 * Different Wither AI (summoning wither skeletons, charge attack, etc).

Effects

 * Fatal poison

Commands

 * Gamerules: drowningdamage

Sounds

 * Jumping sounds when jumping off of and landing on blocks

General

 * Flattening (List for bedrock)
 * Blocks separated from fluids
 * 1.9 combat

Blocks

 * (Stripped) wood item forms
 * (Stripped) wood on x and z axis
 * Cave and void air
 * Beacon beam color mixes, rather than only existing in the 16 colors.

Items

 * Debug stick

Effects

 * (Bad) Luck

Command format

 * NBT access
 * 1.13 commands
 * Block state access

Unsorted

 * Teleporting with Ender pearls make the enderman teleportation sounds in Bedrock but not Java, while eating Chorus Fruit makes teleportation sound in Java but not Bedrock
 * Thrown projectiles don't seem to be affected by the player's motion at all in Bedrock; in Java the player's motion affects projectiles only in certain situations