Java Edition 18w06a

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

Blocks

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

World generation

 * Added  (The End - Floating Islands),   (The End - Medium island),   (The End - High island), and   (The End - Barren island).

Command format

 * Re-added.
 * Added command suggestions for entity selectors.


 * Tags
 * Added new vanilla block tags:
 * ,,  , and.
 * Added new vanilla items tags:
 * ,,  ,  , and.

General

 * Added a recipe book for the furnace.
 * Furnace recipes have been moved to json files.
 * They use.
 * is used to determine the time it should take to smelt an item in the furnace.
 * 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.

World generation

 * Rewrote the world generation system.
 * Large spruce trees now transform nearby grass blocks into podzol when they grow.

Command format

 * Whitespaces are now allowed in entity selectors & blockstate arguments.
 * now accepts different structure names for all structures previously grouped under
 * ,,  , and.

General

 * Removed the customized world type.
 * Will be re-added in the future.

Video
Video made by slicedlime:

Trivia

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