Java Edition 18w06a

18w06a is the seventeenth snapshot for Java Edition 1.13, released on February 9, 2018^[1], which mostly added two new air variants, added new biomes for the End, re-added /enchant, added a furnace recipe book, and the rewrite of the world generation system which resulted in the removal of the Customized world type.

Air

• 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 below or above the world and in unloaded chunks.

Biomes

• 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).

/enchant

• Re-added the command into the game.

Entity selectors

• Added command suggestions for entity selectors.

Recipe book

• Recipe book icon now is a separate file, it's stored in the recipe_button.png.
• 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 item tags:
  • minecraft:banners, minecraft:boats, minecraft:wooden_pressure_plates, minecraft:wooden_slabs, and minecraft:wooden_stairs.

Crops

• Wheat, carrots, potatoes, beetroots, melons, and pumpkins now can grow at night. Previously, they needed at least an internal light level of 9, but this was changed so that they needed only a sky or block light of the same level.

General

• Rewrote the world generation system.
• Structures previously grouped under "Temple" have their spawning locations changed, this allowed /locate to differentiate between the structures.
• In the Nether, vertical air cavities — stretching from bedrock level to as far as Y=35, and filled with lava from bedrock level to Y=10 – now occur in chains across the bottom of the Nether, often forming extensive ravines.

Customized world type

• Removed as a result of the world generation changes.

Trees

• Large spruce trees now transform nearby grass blocks into podzol when they grow.
• Trees occasionally generated upside down.^[2]

General

• Whitespaces are now allowed in entity selectors & blockstate arguments.

/locate

• 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-124424 – minecraft: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.

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

• 
  Terrain in this version