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
 * + to activate
 * Reads chat text aloud


 * Knowledge Book
 * A green-colored book
 * Purpose unknown at this point

Commands

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

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
 * Can fly with players during elytra flight
 * Have health.
 * Come in red, blue, green and cyan.

General

 * Achievements
 * Removed and replaced by advancements

Blocks

 * Glazed Terracotta
 * Textured changed for some of the colors.


 * Beacons
 * Now display their name when hovering over them

Re-upload
At the time of uploading, the crash occurred only on the Mac OS, but later the revised version was re-uploaded with the same name.