Java Edition 21w16a

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 "title": "Minecraft 21w16a",
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 "field": " <span style=\"font-size:smaller\"><abbr title=\"decimal\">dec</abbr>: </span>1073741847<br /> <span style=\"font-size:smaller\"><abbr title=\"hexadecimal\">hex</abbr>: </span>40000017",
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 "field": "<span class=\"plainlinks\">[https://en.wikipedia.org/wiki/Java_version_history#Java_SE_8_.28LTS.29 Java SE 8]</span>",
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 "footer": "<table style=\"margin: auto; word-break: break-word;\">\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\" >[[Java Edition 1.16.5|<span style=\"margin-right:-0.35em\">◄</span>◄  1.16.5]]</td>\n<td style=\"padding: 0.4em\">'''[[Java Edition 1.17|1.17]]'''</td>\n<td style=\"padding: 0.4em\" >[[Java Edition 1.17.1| 1.17.1 <span style=\"margin-right:-0.35em\">►</span>►]]</td>\n</tr>\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\">\n[[Java Edition 21w15a|◄  21w15a]]\n</td>\n<td style=\"padding: 0.4em\">''' 21w16a'''</td>\n<td style=\"padding: 0.4em\">\n[[Java Edition 21w17a| 21w17a ►]]\n</td>\n</tr>\n</table>"
}

21w16a is the eighteenth snapshot for Java Edition 1.17, released on April 21, 2021,^[1] which adds dripstone growth and the ability to grow azalea trees.

Pointed dripstone growth

• If a stalactite is hanging from a dripstone block with a water source above, it slowly grows both the stalactite from above and a stalagmite from below.
  • Growth speed is random but very slow; a single growth step can take several in-game days.
• A stalactite only grows up to 7 blocks long.
• A stalactite only causes stalagmite growth if the floor or stalagmite below is within 10 blocks.
• If the stalactite tip is inside water it doesn't drip, and therefore doesn't trigger any growth.
• If the stalagmite tip is inside water or there is a fluid between the two dripstone blocks, it doesn't receive the water drops, and therefore doesn't grow by a dripping stalactite.
  • A stalagmite or stalactite never grows into a fluid.

Tags

• Added the moss_replaceable block tag.
  • Contains the #base_stone_overworld tag, the #cave_vines tag, and the #dirt tag.

Language

• Added Russian (Pre-revolutionary) language.
• Added Chinese Traditional (Hong Kong) language.

Changes have been made to the official Caves & Cliffs world generation preview data pack, which gives early access to the world generation coming in Java Edition 1.18.

Ore veins

• Large rare snaking collections of ore found underground.
  • Copper mixed with granite is found at and above Y=0; iron mixed with tuff is found below Y=0.

Azalea and flowering azalea

• Can now be fertilized with bone meal to form azalea trees.

Block of raw iron and block of raw gold

• Tweaked the textures.

Emerald ore

• Now attempts to generate 6-24 times per chunk in mountains, instead of 1 time.
• The deepslate variant can now generate naturally.

Infested deepslate

• Can now have random texture rotation like deepslate.

Small dripleaf

• The model was slightly changed.
• The upper leaf is now correctly connected with stem.​^{[more information needed]}

Grass block, mycelium, moss block

• Grass, tall grass, ferns, tall ferns, sweet berry bushes, saplings, flowers, azaleas, sugar cane, dead bushes, and bamboo can now be placed on these blocks.
• Pumpkins and melons can now grow onto these blocks.
• Endermen can now pick up these blocks.

Raw metal

• Tweaked the texture of raw ores.

Recipe book

• The recipes for stonecutting diorite into polished diorite slabs and stairs now unlocks when the player has diorite as opposed to polished diorite.

Statistics

• Renamed the statistic for play time to play_time.
• Included time when game paused for "Time with World Open" (total_world_time).

Resource pack prompt

• Users who previously permanently declined server resource packs are now still shown the pack prompt if the pack is mandatory, instead of being immediately disconnected.

Tags

• Added grass blocks, mycelium, and moss blocks to the dirt block tag.
• Tweaked some tags to no longer unnecessarily mention blocks if they're in the dirt block tag.
• Tweaked the lush_ground_replaceable block tag to call the moss_replaceable tag instead of the lush_plants_replaceable tag, as well as adding gravel and sand.
• Removed the lush_plants_replaceable block tag.

Textures

• Removed the unused rooted_vines_head.png texture.
• Removed stray pixels from the recipe book GUI button.

Changes have been made to the official Caves & Cliffs world generation preview data pack, which gives early access to the world generation coming in Java Edition 1.18.

Aquifers

• Aquifers below Y=0 are sometimes made of lava.

56 issues fixed

From released versions before 1.17

• MC-29522 – stat.playOneMinute adds a value of 1 every tick.
• MC-55775 – Statistics screen sometimes doesn't show up to date information.
• MC-111534 – The firework rocket use statistic doesn't count rockets used for elytra boosting.
• MC-117653 – Recipes and advancements are not granted while most GUIs are open.
• MC-136560 – minecraft.used:minecraft.elytra not functioning.
• MC-136681 – Debug Stick use statistic increases when not allowed to use it.
• MC-157116 – Food that are plantable counts towards using when right click on the ground.
• MC-180529 – TrueType fonts crash on Intel Graphics.
• MC-190128 – Using a flint and steel to ingite TNT is not tracked by the in-game stats.
• MC-223558 – minecraft.used:minecraft.glass_bottle doesn't increase when taking water from a cauldron using a glass bottle.
• MC-223563 – minecraft.used:minecraft.glass_bottle doesn't increase when collecting honey from a beehive or bee nest.
• MC-223638 – minecraft.used:minecraft.shears doesn't increase when carving a pumpkin.
• MC-223639 – minecraft.used:minecraft.shears doesn't increase when collecting honeycombs from a beehive or bee nest.
• MC-223755 – minecraft.used:minecraft.water_bucket doesn't increase when filling a cauldron with a water bucket.

From the 1.17 development versions

• MC-203637 – Mobs don't avoid lava cauldrons when pathfinding despite of setting themselves on fire.
• MC-205236 – Frozen State doesn't go away after respawn when on a server.
• MC-208598 – Baby axolotls take damage when touching a solid block from below / eye height is outside of their hitbox.
• MC-212863 – Glow lichen use the same color as vines on maps.
• MC-213804 – Azalea and flowering azalea undersides are darkened.
• MC-213845 – Big dripleaf plants cannot be placed on top of each other.
• MC-213893 – scoreboard minecraft.used:minecraft.glow_berries triggers when right clicking the ground.
• MC-213927 – Using bone meal on a sapling that is on a moss block consumes bone meal, but doesn't grow into a tree.
• MC-213998 – root_vines_head is unused in-game files.
• MC-214129 – Several dirt blocks are not part of the #minecraft:lush_plants_replaceable tag.
• MC-214293 – Mobs can spawn on top of azaleas.
• MC-215043 – The new small dripleaf's stem texture isn't connected properly with the upper leaf.
• MC-216787 – Cobwebs in mineshafts can generate as if supported by chains.
• MC-217411 – Anvils can become damaged when only falling one block.
• MC-218590 – Error message for commands.give.failed.toomanyitems doesn't translate item name.
• MC-218614 – Inconsistency: Infested Deepslate can't be placed along axis.
• MC-218637 – Inconsistency: Infested deepslate is not rotated randomly like normal deepslate.
• MC-219211 – Two mysterious white pixels can be seen in the upper left corner of the recipe book icon.
• MC-219851 – Applying bone meal to a waterlogged big dripleaf stem creates more waterlogged big dripleaf stems.
• MC-219903 – Silverfish infesting deepslate cause it to rotate.
• MC-220024 – Shader compilation slows or fails the more asterisks are in a multiline comment.
• MC-220187 – Hitbox of azalea and flowering azalea is incorrect.
• MC-220190 – When bone mealing moss blocks with no spreadable blocks nearby, they don't grow grass, bushes and moss carpets.
• MC-220307 – TrueType Font glyphs render incorrectly.
• MC-220641 – Loyalty tridents disappear when your inventory is full.
• MC-220887 – Shader includes fail to compile correctly when missing newline at end of file.
• MC-221258 – Cannot place sugar cane, bamboo and dead bushes on moss blocks.
• MC-221628 – Entities don’t stop glowing after losing the glowing effect.
• MC-221652 – /teleport command to player does not work as in previous versions.
• MC-221655 – Glow Squids and Axolotls Spawn in Monuments.
• MC-222004 – Grass block isn't in the #dirt block tag.
• MC-222517 – A large amount of slime or honey blocks will crash the game.
• MC-222684 – You cannot grow azalea trees by bonemealing Azalea plants.
• MC-222778 – minecraft.used:minecraft.candle doesn't increase when placing a candle on to a cake.

From the previous development version

• MC-223260 – Emerald ore does not generate as intended.
• MC-223382 – A marker's data tag can be shared among multiple markers.
• MC-223553 – minecraft.used:minecraft.glow_ink_sac doesn't increase when applying a glow ink sac to a sign.
• MC-223554 – minecraft.used:minecraft.ink_sac doesn't increase when applying an ink sac to a sign.
• MC-223555 – minecraft.used:minecraft.COLOR_dye doesn't increase when applying a dye to a sign.
• MC-223557 – minecraft.used:minecraft.bucket doesn't increase when taking powder snow, lava, or water from a cauldron using a bucket.
• MC-223756 – minecraft.used:minecraft.powder_snow_bucket doesn't increase when filling a cauldron with a powder snow bucket.
• MC-223757 – minecraft.used:minecraft.lava_bucket doesn't increase when filling a cauldron with a lava bucket.