Java Edition 21w13a

21w13a is the fifteenth snapshot for Java Edition 1.17 released on March 31, 2021, which adds goats, light blocks and makes tweaks to caves and ore blob generation.

Blocks

 * Light Block
 * A new waterloggable source of light, originally was a Bedrock exclusive.
 * Behaves like air and it is visible only when the item is held, similar to barriers.
 * Unlike barriers, light blocks can only be targeted when holding the item.
 * Obtainable only with.
 * Right-click cycles light level.

Mobs

 * Goat
 * Spawn in mountains.
 * Does not drop anything for now.
 * Jump higher than other mobs.
 * Can be tempted and bred using wheat.
 * A bucket can be used to get milk.

General

 * Acessibility
 * Added an alternative solid black background color for the Mojang Studios loading screen, toggleable with the “Monochrome Logo” accessibility option.


 * Tags
 * Added the block tag.
 * Contains dirt, coarse dirt, podzol and rooted dirt.
 * Added the block tag.
 * Contains snow, snow blocks and powder snow.
 * Added the entity type tag.
 * Contains tropical fish, pufferfish, salmon, cod, squid and glow squid, which were the previous contents of the entity type tag.
 * Added the entity type tag.
 * Contains striders, blazes, and magma cubes.
 * Added the entity type tag.
 * Contains strays, polar bears and snow golems.

Blocks

 * Bamboo
 * Can now be planted on rooted dirt.


 * Candle
 * Candles can now be extinguished by splash water bottles and by lingering water bottles.


 * Flowering Azaleas and Flowering Azalea Leaves
 * Are now seen as small flowers by the game.
 * Bees can pollinate them and can remember their position.
 * Bees follow players holding these blocks and can be bred with them.
 * Suspicious stew can be crafted with these blocks, giving a suspicious stew that gives no status effect.
 * These blocks cannot be fed to brown mooshrooms.
 * Saplings grown next to these blocks have a small chance to have a bee nest.


 * Powder Snow
 * Powder snow’s hardness was slightly increased, from 0.1 to 0.25.
 * Freeze time has decreased to 7 seconds and hurt frequency has decreased to 2 seconds.
 * Entities on fire now melt powder snow when colliding.
 * Increased vertical movement speed within powder snow.
 * Mobs now shake when they are fully frozen.


 * Rooted Dirt
 * The top texture is now randomly rotated.
 * Shovels are now the correct tool for collecting

Items

 * Leather Horse Armor
 * Now protects horses from freeze damage.
 * Although horses are the only entities that can wear leather horse armor through gameplay, leather horse armor worn by other entities through commands will also be protected.


 * Suspicious Stew
 * Can now be eaten even if the player is at full hunger.

Mobs

 * Axolotl
 * Axolotls now spawn in underground water sources.
 * Axolotls will now always chase after and attack squids, glow squids, tropical fish, cod, salmon, pufferfish, drowned, guardians, and elder guardians
 * Axolotls now have a two-minute cooldown after hunting non-hostile targets such as fish and squids.
 * They will prioritize targeting hostile mobs first before hunting.
 * Blue, cyan, gold, and lucy axolotls have had the textures of the outlines on their tails slightly changed.
 * Cyan, gold, and lucy axolotls have had the textures of the frills on their head slightly changed.
 * Axolotls now save their age, variant, and health when stored in a water bucket.


 * Blaze, Magma Cube, and Strider
 * Take increased freeze damage.


 * Elder Guardians, Guardians, and Polar Bears
 * Now drop cooked cod or salmon instead of raw cod or salmon if on fire when killed or killed by a fire source.


 * Endermen
 * Can now pick up rooted dirt, flowering azaleas, and flowering azalea leaves.


 * Glow Squid
 * Glow squids now spawn in underground water sources.


 * Husks, Zombies, and Zombie Villagers
 * Now drop baked potatoes instead of normal potatoes if on fire when killed or killed by a fire source.


 * Polar Bear, Snow Golem, and Stray
 * Are now immune to freezing.


 * Skeleton
 * Skeletons converting to strays now only require the 7 seconds it takes for an entity to be fully frozen to begin converting, instead of the 30 seconds it took before.


 * Villagers
 * Mason villagers can now sell 4 dripstone blocks for 1 emerald.


 * Wandering Trader
 * Added the following trades to Wandering Trader:
 * Will sell 2 Pointed Dripstones for 1 emerald.
 * Will sell 2 Rooted Dirt for 1 emerald.
 * Will sell 2 Moss Blocks for 1 emerald.

World generation

 * Caves
 * Made carvers less likely to be too flat to walk through.
 * Increased likelihood of "megacaves" (large cheese caves).
 * Reduced likelihood of "toothpick pillars" (tall 1-block thin pillars).
 * Other tweaks were made to make the cheese caves more varied.
 * Deepslate blobs can now be found between heights 0 and 16.
 * Dripstone clusters can now be found rarely in normal caves.
 * Ore
 * Copper ore now generates uniformly between levels 0 and 63 instead of generating with a normal curve from 0 to 96.
 * Slightly more iron.
 * Larger diamond blobs sometimes form.
 * Mineshafts
 * Increased the max length of pillars and chains.
 * Glow Berries can be found in Mineshaft chest minecarts.
 * Shipwrecks
 * Moss blocks can be found in chests.

Gameplay

 * Build limit
 * The message for letting the player know they are attempting to build beyond the build limit no longer says "blocks" at the end.


 * Advancements
 * Goats and axolotls are now required for "Two by Two".
 * Axoltls have always been available for "The Parrots and the Bats" and goats can now be used as well, though no changes were made to the advancement to let this happen.
 * The advancement for obtaining diamond armor is now capitalized as "Cover Me with Diamonds", as opposed to "Cover Me With Diamonds".


 * Mob Spawning
 * Added a new mob cap category, underground water creature.
 * Used by axolotls and glow squids.
 * Have a cap of 5, are friend, are not persistent, and despawn at 128 blocks or more from the player.

General

 * Code
 * Unused parts of code (unused static fields and methods) are no longer removed.
 * Although this does not affect the game itself, adds more info for modders.


 * Materials
 * Removed the coral material.
 * Added the moss material.


 * Tags
 * Changed the block tags to use the  block tag, removing other mentions of dirt blocks from the tags.
 * Added all copper slab and stair variants to the block and item tags, respectively.
 * Added flowering azalea leaves and flowering azaleas to the block and item tags.
 * Changed the entity type tag to have the previous contents of the  tag, as well as adding elder guardians.
 * The previous contents of the tag have been added to.
 * Removed the entity type tag.
 * Added leather horse armor to the item tag.


 * Textures
 * Removed some unused textures, including:
 * The "calibrated sculk sensor" textures.
 * The texture for the zombie villager before 1.9.
 * The "arrow.png" placed outside of the arrow folder that included the purple arrow texture.
 * The ruby item texture.
 * The piglin leather armor models.
 * The footprint particle.