Minecraft Wiki
Minecraft 18w20a
Java Edition 18w20a.png

Java Edition



Release date

May 15, 2018

Snapshot for



Client (.json)

Protocol version


Data version


18w20a[1] is the thirty-fifth snapshot released for Java Edition 1.13.


Command format
  • Teams can now have a prefix and a 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:

Non-mob entities[]

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.


Video made by slicedlime:


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


  1. "Minecraft Snapshot 18w20a" – Minecraft.net, May 15, 2018