Java Edition 17w13a

17w13a is the second snapshot released for 1.12.

General

 * Advancements
 * Replaces achievements
 * Can be customized via JSON files
 * Tab-based UI
 * More tabs supported but only 4-5 planned for vanilla: "mine & craft", "nether", "end", "combat", "engineering"
 * Different background per tab, single texture on repeat for now
 * Data-driven UI, including positioning and layout


 * Recipe book
 * Catalogs recipes that are unlocked when the criteria are met
 * When a recipe is clicked, it will appear in the crafting grid, and can be crafted if materials are available


 * Narrator
 * + toggles a text-to-speech engine that automatically reads player chat messages, including the name.
 * The Narrator will not read commands or command outputs, nor will it read messages produced with.


 * NBT tags
 * / : Contains entity data about an entity on the left and right shoulders of the player.
 * : Changes to 1 if the player leaves the End through the portal.
 * : A string containing a list of recipes, formatted as JSON, that the player has seen.
 * : A list of crafting recipes to unlock for the player that right-clicks while holding a Knowledge Book.
 * If this is not specified, the Knowledge Book will not be consumed.

Commands

 * Can unlock, or lock, the given recipes for the given player
 * If  is specified, it will lock or unlock all recipes for the player
 * Can grant, test or revoke advancements, and particular advancement criteria, for a given player

Gamerules

 * Off by default
 * Enabling will only allow players to craft recipes they have unlocked

Items

 * Spawn eggs
 * Parrot (new mob): Green with red dots.


 * Knowledge Book
 * A green-colored book
 * Currently obtainable only with the command.
 * A Knowledge Book with a  NBT tag, which contains a list of item IDs, will be consumed and unlock the specified items' recipes for any player that  it
 * Especially useful when is set to true

Mobs

 * Parrots
 * Tamable with cookies
 * Fly around, but sit when "tired"
 * Imitates sounds of other mobs
 * Right-click tamed parrots to place them on your shoulder
 * Will let go if the player jumps
 * Can fly with players during elytra flight
 * Have health.
 * Come in red, blue, green and cyan.

General

 * Achievements
 * Removed and replaced by advancements


 * Crafting
 * Closing the crafting interface with items inside will no longer drop the items in front of you, but will send them instead to the inventory.


 * Java version
 * This is the first snapshot to use, and thus require, Java 8.

Blocks



 * Glazed Terracotta
 * Textured changed for cyan, magenta, orange, and white glazed terracotta, to remove unintentional and potentially offensive imagery.


 * Beacons
 * Now display their name when hovering over them


 * Enchantment Table
 * Now display their name when hovering over them

Re-upload
At the time of uploading the first build, users reported issues of crashing on macOS. A hotfix was later released which fixed the crash issue on the operating system.