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Java Edition 18w06a

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Minecraft 18w06a

Java Edition



Release date

February 9, 2018

Snapshot for



Client (.json)

Protocol version


Data version


18w06a[1] is the seventeenth snapshot released for Java Edition 1.13, which mostly added two new air variants, added new biomes for the End, re-added /enchant, added a furnace recipe book, and removed the Customized world type, as well as the rewrite of the world generation system as a result.




Added minecraft:cave_air and minecraft:void_air.

    • Both have the exact same properties as regular air.
    • minecraft:cave_air generates in caves.
    • minecraft:void_air is used internally for blocks above (>= 256) and below (< 0) the world, and in unloaded chunks.

World generation[edit]

  • Added minecraft:sky_island_low (The End - Floating Islands), minecraft:sky_island_medium (The End - Medium island), minecraft:sky_island_high (The End - High island), and minecraft:sky_island_barren (The End - Barren island).

Command format[edit]

  • Re-added the command into the game.
Entity selectors
  • Added command suggestions for entity selectors.


Recipe book
  • Added a recipe book for the furnace.
    • Furnace recipes have been moved to JSON files.
      • They use "type": "smelting".
      • cookingtime is used to determine the time it should take to smelt an item in the furnace.
      • experience is used to determine the amount of experience a player should get when picking the resulting item out of the furnace manually.
      • Fuel is not included and is still hardcoded.
  • "Unlocked recipe" toasts now show an icon in the top left to specify whether the unlocked recipe is a crafting or smelting recipe.
  • Added new vanilla block tags:
    • minecraft:banners, minecraft:wooden_pressure_plates, minecraft:wooden_slabs, and minecraft:wooden_stairs.
  • Added new vanilla items tags:
    • minecraft:banners, minecraft:boats, minecraft:wooden_pressure_plates, minecraft:wooden_slabs, and minecraft:wooden_stairs.


World generation[edit]

  • Rewrote the world generation system.
Customized world type
  • Removed from the game.
    • Will be re-added in the future.[1]

Command format[edit]

  • Whitespaces are now allowed in entity selectors & blockstate arguments.
  • Now accepts different structure names for all structures previously grouped under Temple.
    • Desert_Pyramid, Igloo, Jungle_Pyramid, and Swamp_Hut.


27 issues fixed
From released versions before 1.13
  • MC-29490 – 1.7+ lighting bug/black spots.
  • MC-50640 – Big oak tree inconsistency.
  • MC-77488 – TAB player list sorts player names based on ASCII values instead of alphabetically.
  • MC-96929/enchant command missing indicator for affected entity and enchanting.
  • MC-101232 – Big tree generator causes memory leak.
  • MC-103023 – Village house overlap.
  • MC-111341 – Plains village generating in desert.
  • MC-113577 – Mesa (Bryce) biome generates with seed of last world which generated the same biome before.
  • MC-124695 – Flint and steel in a dispenser loses durability when not igniting.
From the 1.13 development versions
  • MC-121633 – Tabbing in and out of the game in fullscreen messes up recipe book.
  • MC-121641 – Impossible selector combinations don't fail to build.
  • MC-121644 – Recipe book tab sound plays twice.
  • MC-121811 – NBT path parser might be too lenient.
  • MC-121901 – Game crashes when there is closing square bracket without opening in command.
  • MC-122673/locate always returns z=64.
  • MC-123150 – Water does not generate obsidian during world generation.
  • MC-123482 – The 'paintings.json' recipe file does not use the 'minecraft:wool' tag.
  • MC-123628 – Unexpected behavior when using "execute store success score" with a function.
  • MC-123805 – Command suggestions ignore characters after an incomplete namespace.
  • MC-123888/clear on a player with no items dumps raw TextComponent.
  • MC-124128 – Fishing bobber is missing its translation string.
  • MC-124372 – Wrong/weird sorting order in tab-completion.
  • MC-124424minecraft:load tag does not run on map load.
  • MC-124649 – Nether portals can no longer be activated from the side.
From the previous development version
  • MC-124683 – Tab suggestion box for entity selector closing square bracket misaligned in certain situations.
  • MC-124721 – Command syntax help text can be empty for trailing selectors in some cases.
  • MC-124727 – Tab-completion does not work correctly for tags.


Video made by slicedlime:


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


  1. a b "Minecraft Snapshot 18w06a" – Minecraft.net, February 9, 2018