Java Edition 21w11a

21w11a is the fourteenth snapshot for Java Edition 1.17 released on March 17, 2021, which fixes numerous amount of bugs, many of which are relating to textures and rendering issues as well as adds new mechanics related to copper.

General

 * Controls
 * Added shortcut to generate and persist performance metrics from in-game, similar to.
 * Metrics are saved in .minecraft/debug/profiling/.zip.


 * Particles
 * Added the particles.


 * Tags
 * Added the item tag.
 * Contains all pickaxes.

Blocks

 * Amethyst Cluster
 * Breaking by hand, piston, or other means now drops 2 amethyst shards instead of dropping none.
 * Breaking with any pickaxe can now be used to drop 4 amethyst shards instead of an iron pickaxe or higher.


 * Azalea
 * Can now be used as fuel in a furnace.


 * Big Dripleaf
 * Breaking the stem now drops the block.
 * Now can be fertilized with bone meal on the stem to make the dripleaf grow.


 * Block of Copper, Cut Copper, and variants
 * Honeycomb can now be to wax them, to match Bedrock Edition.
 * Yellow particles are formed when waxing the block.
 * Using a dispenser with honeycomb waxes them, matching Bedrock Edition.
 * Axes can now be to scrape off wax and oxidation (one stage at a time).
 * White particles are formed when scraping off wax from the block.
 * Lightning now may clean oxidation, reverting the oxidation process by one or several stages.
 * Chances of cleaning and number of reverted stages are higher the closer to the struck block.
 * Waxed copper blocks can be crafted into 4 copper ingots, to match Bedrock Edition.


 * Brewing Stand
 * Changed potion icon in the brewing stand GUI to reflect the new bottle texture in the Texture Update.
 * Removed some stray pixels from the GUI texture.


 * Cauldron
 * Lava buckets and powder snow buckets can now be emptied in the respective filled cauldrons.


 * Cave Vines
 * Renamed the parts from "cave vines head" and "cave vines body" to "cave vines" and "cave vines plant", respectively.
 * The IDs have also changed.
 * Now all parts give a light level of 14.
 * Previously, only the bottom-most part gave level 14; others gave only 10.
 * Now slow down the player.
 * Can now be climbed.


 * Gilded Blackstone
 * The texture has changed.


 * Glow Lichen
 * Bone meal can no longer be used on it if it has no blocks to spread to.
 * Can now be used on a composter.


 * Grass Block
 * Changed part of the dirt of the side texture of snowy grass to match regular grass.


 * Hanging Roots
 * Now renders randomly offset from the center.
 * Removing the support block for it no longer allows it to float.


 * Lectern
 * Slightly shrunk top part to prevent z-fighting with fire.


 * Lightning Rod
 * Can now be waterlogged.
 * Now turns completely white when struck by lightning.
 * Now has a new block state: powered, used to determine whether the rod turns completely white when struck by lightning.
 * Now emits particles when in contact with rain.


 * Moss Block
 * Can be combined with cobblestone or stone bricks to make the mossy versions of those blocks.
 * Vines can still be used, in addition to moss blocks.
 * In addition to axes, hoes are now an appropriate tool to collect it.


 * Pumpkin
 * Changed one pixel on the pumpkin's top texture to remove the possibility for a small swastika to be displayed.


 * Rooted Dirt
 * bone meal on any side grows hanging roots underneath.


 * Signs
 * Changed the textures of acacia, birch, dark oak, jungle, oak, and spruce signs to reflect new textures in the Texture Update.


 * Small Dripleaf
 * The facing direction of small dripleaf is now determined by which direction the player is facing when placing it.


 * Smoker
 * Changed the top texture of the smoker.


 * Spore Blossom
 * Removing the support block for it no longer allows it to float.


 * Tinted Glass
 * No longer causes suffocation.
 * Mobs can no longer spawn on top of it.

Items

 * Jungle Doors
 * Changed the texture of the jungle door item to reflect the block texture in the Texture Update.


 * Spectral Arrows
 * Fired spectral arrows are now entirely golden to reflect the item texture in the Texture Update.


 * Sugar Cane
 * Changed the texture of the sugar cane item to better reflect biome tinting added in 1.7.2.

Mobs

 * Cats
 * Changed the texture of the siamese cat type, mostly brightening it.


 * Guardian and Elder Guardian
 * Removed some stray pixels from the texture file.


 * Villagers and Zombie Villagers
 * Moved the librarian top overlay texture to correct side of its torso.

Non-mob entities

 * Paintings
 * Changed the back texture to reflect the planks texture in the Texture Update.

World generation

 * Caves
 * Tweaked the cave sizes.


 * Lush caves
 * Reduced the amount of floating water in lush caves.


 * Blobs
 * Slightly increased the frequency of diamond ore blobs.
 * If any ore replaces tuff, it will now be deepslate ore.

Gameplay

 * Freezing
 * Frozen hearts now have a different texture in Hardcore mode to reflect the regular heart texture.


 * Spectator mode
 * It is now possible to see while inside lava and powder snow.


 * Subtitles
 * Added subtitles for amethyst blocks chiming.
 * Added subtitles for waxing and removing wax from copper blocks.
 * These are "Wax on" and "Wax off", but are not triggered in-game.
 * Changed the subtitles for stripping logs and wood from "Axe scrapes" to "Axe strips".
 * "Axe scrapes" is now used for copper blocks. However, it is not triggered in-game.

General

 * Tags
 * Added cave vines and cave vines plant to the block tag.
 * Added tuff to the block tag.
 * Added tinted glass to the block tag.
 * Removed tuff from the block tag.

Video
Videos made by slicedlime:

Trivia

 * This version has the same data version as Combat Test 7b, even though these versions should not be compatible with each other.
 * 21w11a contained the largest number of bug fixes in a single snapshot, with at least 127, beating 20w22a at least 3.