Java Edition 18w20a

18w20a is the thirty-fifth snapshot for Java Edition 1.13, released on May 15, 2018^[1].

Command format

• Teams can now have a prefix and a suffix, specified as raw JSON text.
  • /team option <team> prefix <prefix>
  • /team option <team> suffix <suffix>

• Changed IDs of several blocks:

Old ID	New ID
kelp_top	kelp
kelp	kelp_plant
prismarine_bricks_slab	prismarine_brick_slab
prismarine_bricks_stairs	prismarine_brick_stairs

• Changed names of several blocks:

Old name	New name
Weighted Pressure Plate (Heavy)	Heavy Weighted Pressure Plate
Weighted Pressure Plate (Light)	Light Weighted Pressure Plate
Prismarine Bricks Slab	Prismarine Brick Slab
Prismarine Bricks Stairs	Prismarine Brick Stairs

• Changed IDs of several items:

Old ID	New ID
kelp_top	kelp
kelp	kelp_plant
cod_mob_spawn_egg	cod_spawn_egg
salmon_mob_spawn_egg	salmon_spawn_egg

• Changed names of several items:

Old name	New name
Gold Horse Armor	Golden Horse Armor
Chain Helmet	Chainmail Helmet
Chain Chestplate	Chainmail Chestplate
Chain Leggings	Chainmail Leggings
Chain Boots	Chainmail Boots
Milk	Milk Bucket
Seeds	Wheat Seeds
Spawn Bat	Bat Spawn Egg
Spawn Blaze	Blaze Spawn Egg
Spawn Cave Spider	Cave Spider Spawn Egg
Spawn Chicken	Chicken Spawn Egg
Spawn Cod	Cod Spawn Egg
Spawn Cow	Cow Spawn Egg
Spawn Creeper	Creeper Spawn Egg
Spawn Dolphin	Dolphin Spawn Egg
Spawn Donkey	Donkey Spawn Egg
Spawn Drowned	Drowned Spawn Egg
Spawn Elder Guardian	Elder Guardian Spawn Egg
Spawn Enderman	Enderman Spawn Egg
Spawn Endermite	Endermite Spawn Egg
Spawn Evoker	Evoker Spawn Egg
Spawn Ghast	Ghast Spawn Egg
Spawn Guardian	Guardian Spawn Egg
Spawn Horse	Horse Spawn Egg
Spawn Husk	Husk Spawn Egg
Spawn Llama	Llama Spawn Egg
Spawn Magma Cube	Magma Cube Spawn Egg
Spawn Mooshroom	Mooshroom Spawn Egg
Spawn Mule	Mule Spawn Egg
Spawn Ocelot	Ocelot Spawn Egg
Spawn Parrot	Parrot Spawn Egg
Spawn Phantom	Phantom Spawn Egg
Spawn Pig	Pig Spawn Egg
Spawn Polar Bear	Polar Bear Spawn Egg
Spawn Pufferfish	Pufferfish Spawn Egg
Spawn Rabbit	Rabbit Spawn Egg
Spawn Salmon	Salmon Spawn Egg
Spawn Sheep	Sheep Spawn Egg
Spawn Shulker	Shulker Spawn Egg
Spawn Silverfish	Silverfish Spawn Egg
Spawn Skeleton	Skeleton Spawn Egg
Spawn Skeleton Horse	Skeleton Horse Spawn Egg
Spawn Slime	Slime Spawn Egg
Spawn Spider	Spider Spawn Egg
Spawn Squid	Squid Spawn Egg
Spawn Stray	Stray Spawn Egg
Spawn Tropical Fish	Tropical Fish Spawn Egg
Spawn Turtle	Turtle Spawn Egg
Spawn Vex	Vex Spawn Egg
Spawn Villager	Villager Spawn Egg
Spawn Vindicator	Vindicator Spawn Egg
Spawn Witch	Witch Spawn Egg
Spawn Wither Skeleton	Wither Skeleton Spawn Egg
Spawn Wolf	Wolf Spawn Egg
Spawn Zombie	Zombie Spawn Egg
Spawn Zombie Horse	Zombie Horse Spawn Egg
Spawn Zombie Pigman	Zombie Pigman Spawn Egg
Spawn Zombie Villager	Zombie Villager Spawn Egg

• Changed the name of lightning bolt:

Old name	New name
Bolt of Lightning	Lightning Bolt

• Players in Creative mode can now sleep even if monsters are nearby.
• Many internal IDs and data values have been changed, such as texture and structure files.

50 issues fixed

From released versions before 1.13

• MC-9620 – F1 and open chat makes hotbar appear.
• MC-116928 – Command block and spawner minecart data fixer not working correctly.

From the 1.13 development versions

• MC-121743 – Feedback of some commands uses OS locale for formatting decimal numbers.
• MC-122331 – Shield with banner has broken colors.
• MC-122428 – Fire doesn't disappear / Fire spread too quick.
• MC-123136 – Vines placed against the ceiling and the wall are not upgraded correctly.
• MC-123224 – Levers placed on the ground and ceiling rotate when upgrading.
• MC-123466 – Scheduled block updates are lost when upgrading a world from 1.12.2.
• MC-123589 – Inconsistent texture renaming.
• MC-123790 – "italic":false in custom item names does not make name non-italic.
• MC-124065 – Spawn Egg Data Loss on 1.7.10 -> 1.13 Upgrade.
• MC-124112 – Renamed placed droppers lose their custom name when upgrading from 1.12.2.
• MC-124203 – Right clicking adult skeleton horse or mule with spawn egg does not spawn baby.
• MC-124343 – Command block minecart data walker never runs due to comparing different types.
• MC-124496 – Debug Stick text is not translated in other languages.
• MC-124998 – Command block minecarts disappear upon reloading the world.
• MC-125091 – Bonemeal doesn't place flowers on plains biome.
• MC-125092 – Bonemeal stops placing plants after placing flower.
• MC-125182 – Block Entities are not upgraded properly when upgrading from 1.12.2.
• MC-125307 – When a trident hits a mob, it will not fall right below it.
• MC-125310 – Trident can penetrate the closed shulker / wither / ender dragon / invulnerable mobs.
• MC-125342 – Trident cannot destroy the armor stand.
• MC-125362 – Attribute modifier tooltips use OS locale.
• MC-125408 – Loyalty tridents return to spectators (but don't get picked up).
• MC-125625 – Glass panes, fences, iron bars and cobblestone walls sometimes fail to upgrade
• MC-125799 – Chests placed in earlier versions make no sound when opened.
• MC-125919 – Tridents enchanted with channeling will work in the end during a thunderstorm under certain conditions.
• MC-126034 – The name of prismarine brick slab and stairs is not consistent with other brick slabs and stairs.
• MC-126241 – Crash on World Load - Skyblock 2.1 Vanilla.
• MC-126300 – Unlike sword, trident can accidentally break blocks in creative mode.
• MC-126373 – Density of nether and overworld ore blobs significantly lower in 18w versions.
• MC-126796 – Tropical fish are disappearing.
• MC-126883 – Shulkers becomes dark purple when upgrading from 1.12.2.
• MC-127027 – Squid's ink clouds appear to render/spawn sideways or lopsided.
• MC-127250 – Drowned Chicken Rider is invincible and doesn't attack player.
• MC-127252 – Killing the Drowned mob doesn't count towards the Monster Hunter/Monsters Hunted advancements.
• MC-127301 – Shipwrecks always face north.
• MC-127478 – Texture metadata parsing fails if animation block is not present.
• MC-127730 – Fish have a strange shadow.
• MC-127993 – Solid blocks placed on unhydrated farmland.
• MC-128013 – Player can walk on the water with slow falling effect.
• MC-128125 – When swimming within bottom stairs or slabs, the water shader does not appear.
• MC-128472 – When swimming, the player can stand up even though there is a block above.
• MC-128495 – Igloos often fail to generate completely.
• MC-128615 – Cod and salmon loot table have redundant set_count function.
• MC-128851 – The "A Furious Cocktail" advancement does not require Resistance.
• MC-129236 – Swimming Sometimes Doesn't Work
• MC-129244 – Lava uses the water texture on multiplayer
• MC-129281 – Player's position, gamemode, inventory, effects gets reset to an older point upon re-entering a worldsave

From the previous development version

• MC-129371 – Loading previous buffet worlds into 18w19b turns it into a default world type

Other fixes

• Worlds created in 18w16a can also now be opened.

• Unlike most of the first-of-the-week snapshots, this was released on a Tuesday instead of Wednesday.