Java Edition 21w15a

21w15a is the seventeenth snapshot for Java Edition 1.17, released on April 14, 2021, which added the ability for goats to ram mobs and armor stands. It also rolled back a few changes like height limit and caves due to being really technical and will be moved to a holiday release as seen in the Caves and Cliffs Announcement with Agnes and Henrik.

Blocks

 * Raw Metal Blocks
 * Added block of raw iron, block of raw copper and block of raw gold.
 * Can be obtained through crafting.
 * Can be crafted into their respective raw metal
 * Can't be smelted.
 * Piglins don't pick up block of raw gold.

Changes

 * A crinkly, crunchy sound now plays when Bone Meal is used
 * Reordered some blocks in the Building Blocks Tab in Creative Menu
 * Goats will avoid walking on Powder Snow
 * Goats can now ram other mobs and armor stands to knock them a few blocks
 * Tweaked the textures of raw ore items

World Generation

 * World height has been switched back to the 1.16 levels.
 * Noise caves and aquifers have been switched off.
 * Cave and ravine carvers have been returned to their old settings.
 * Crack carvers have been switched off.
 * Ore distribution has been returned to the 1.16 setup.
 * Copper now generates between the bottom of the world and height 192, being most common around height 96.
 * Tuff now generates in blobs between heights 0 and 16.
 * Worlds created in snapshot 21w05b or any earlier version can now once again be opened.
 * Worlds created in any version between snapshot 21w06a and 21w14a can no longer be opened.

General

 * Title Screen
 * The main menu background is now in an Amethyst Geode.

Trivia

 * This is the first time the world height was decreased since Infdev.