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{{Infobox version
|title=Minecraft 21w16a
|image=21w16a.jpg
|image2=Java Edition 21w16a.png
|edition=Java
|type=Snapshot
|date=April 21, 2021
|jsonhash=478bdf8d8723c9894c611c3b31df815f168b9e82
|clienthash=f124f2aad604e88f27f010834d82c7af85506b6c
|clientmap=7a8e3a33afdd6e6ab669852685e1b12ba338234a
|serverhash=b8bacc67a9db84db59e2f97e9a9fba3a242480a8
|servermap=63799f9f0f3738a0832cf3a3a9593b2f8adc97c6
|otherdl={{dl|ebe5698b1f6787e30662691f57511a08587db502|custom|name=CavesAndCliffsPreview.zip|title=Data pack}}<ref group=note>Re-enables features set to release for [[Minecraft:Java Edition 1.18|1.18]].</ref>
|parent=1.17
|prevparent=1.16.5
|prev=21w15a
|next=21w17a
|nextparent=1.17.1
}}
<onlyinclude>

'''21w16a''' is the eighteenth [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.17]], released on April 21, 2021,<ref>{{snap|21w16a|April 21, 2021}}</ref> which adds dripstone growth and the ability to grow azalea trees and fixes bugs.

== Additions ==
=== Gameplay ===
'''[[Minecraft:Pointed dripstone]] growth'''
* If a stalactite is hanging from a [[Minecraft: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.

=== General ===
'''[[Minecraft:Tag]]s'''
* Added the <code>moss_replaceable</code> block tag.
** Contains the [[Minecraft:Tag#blocks base_stone_overworld|#base_stone_overworld]] tag, the [[Minecraft:Tag#blocks cave_vines|#cave_vines]] tag, and the [[Minecraft:Tag#blocks dirt|#dirt]] tag.

'''[[Minecraft:Language]]'''
* Added Russian (Pre-revolutionary) language.
* Added Chinese Traditional (Hong Kong) language.

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

'''[[Minecraft:Ore vein]]s'''
* Large rare snaking collections of [[Minecraft:ore]] found underground.
** Copper mixed with granite is found at and above Y=0; iron mixed with tuff is found below Y=0.

== Changes ==
=== Blocks ===
'''[[Minecraft:Azalea]] and [[Minecraft:flowering azalea]]'''
* Can now be fertilized with [[Minecraft:bone meal]] to form azalea trees.

'''[[Minecraft:Block of raw iron]] and [[Minecraft:block of raw gold]]'''
* Tweaked the textures.

'''[[Minecraft:Emerald ore]]'''
* Now attempts to generate 6-24 times per [[Minecraft:chunk]] in [[Minecraft:mountains]], instead of 1 time.
* The deepslate variant can now generate naturally.

'''[[Minecraft:Infested deepslate]]'''
* Can now have random texture rotation like deepslate.

'''[[Minecraft:Small dripleaf]]'''
* The model was slightly changed.
* The upper leaf is now correctly connected with stem.{{more info}}

'''[[Minecraft:Grass block]], [[Minecraft:mycelium]], [[Minecraft: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.

=== Items ===
'''[[Minecraft:Raw metal]]'''
* Tweaked the texture of raw ores.

=== Gameplay ===
'''[[Minecraft:Recipe book]]'''
* The recipes for stonecutting [[Minecraft:diorite]] into polished diorite slabs and stairs now unlocks when the player has diorite as opposed to polished diorite.

=== General ===
'''[[Minecraft:Statistics]]'''
* Renamed the statistic for play time to <code>play_time</code>.
* Included time when game paused for "Time with World Open" (<code>total_world_time</code>).

'''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.

'''[[Minecraft:Tag]]s'''
* Added grass blocks, mycelium, and moss blocks to the <code>dirt</code> block tag.
* Tweaked some tags to no longer unnecessarily mention blocks if they're in the dirt block tag.
* Tweaked the <code>lush_ground_replaceable</code> block tag to call the <code>moss_replaceable</code> tag instead of the <code>lush_plants_replaceable</code> tag, as well as adding gravel and sand.
* Removed the <code>lush_plants_replaceable</code> block tag.

'''Textures'''
* Removed the unused <code>rooted_vines_head.png</code> texture.
* Removed stray pixels from the recipe book GUI button.

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

'''[[Minecraft:Aquifer]]s'''
* Aquifers below Y=0 are sometimes made of [[Minecraft:lava]].

== Fixes ==
{{fixes|fixedin=21w16a
|;old
|29522|<code>stat.playOneMinute</code> adds a value of 1 every tick.
|55775|Statistics screen sometimes doesn't show up to date information.
|111534|The firework rocket use statistic doesn't count rockets used for elytra boosting.
|117653|Recipes and advancements are not granted while most GUIs are open.
|136560|<code>minecraft.used:minecraft.elytra</code> not functioning.
|136681|Debug Stick use statistic increases when not allowed to use it.
|157116|Food that are plantable counts towards using when right click on the ground.
|180529|TrueType fonts crash on Intel Graphics.
|190128|Using a flint and steel to ingite TNT is not tracked by the in-game stats.
|223558|<code>minecraft.used:minecraft.glass_bottle</code> doesn't increase when taking water from a cauldron using a glass bottle.
|223563|<code>minecraft.used:minecraft.glass_bottle</code> doesn't increase when collecting honey from a beehive or bee nest.
|223638|<code>minecraft.used:minecraft.shears</code> doesn't increase when carving a pumpkin.
|223639|<code>minecraft.used:minecraft.shears</code> doesn't increase when collecting honeycombs from a beehive or bee nest.
|223755|<code>minecraft.used:minecraft.water_bucket</code> doesn't increase when filling a cauldron with a water bucket.
|;dev
|203637|Mobs don't avoid lava cauldrons when pathfinding despite of setting themselves on fire.
|205236|Frozen State doesn't go away after respawn when on a server.
|208598|Baby axolotls take damage when touching a solid block from below / eye height is outside of their hitbox.
|212863|Glow lichen use the same color as vines on maps.
|213804|Azalea and flowering azalea undersides are darkened.
|213845|Big dripleaf plants cannot be placed on top of each other.
|213893|scoreboard <code>minecraft.used:minecraft.glow_berries</code> triggers when right clicking the ground.
|213927|Using bone meal on a sapling that is on a moss block consumes bone meal, but doesn't grow into a tree.
|213998|<code>root_vines_head</code> is unused in-game files.
|214129|Several dirt blocks are not part of the <code>#minecraft:lush_plants_replaceable</code> tag.
|214293|Mobs can spawn on top of azaleas.
|215043|The new small dripleaf's stem texture isn't connected properly with the upper leaf.
|216787|Cobwebs in mineshafts can generate as if supported by chains.
|217411|Anvils can become damaged when only falling one block.
|218590|Error message for <code>commands.give.failed.toomanyitems</code> doesn't translate item name.
|218614|Inconsistency: Infested Deepslate can't be placed along axis.
|218637|Inconsistency: Infested deepslate is not rotated randomly like normal deepslate.
|219211|Two mysterious white pixels can be seen in the upper left corner of the recipe book icon.
|219851|Applying bone meal to a waterlogged big dripleaf stem creates more waterlogged big dripleaf stems.
|219903|Silverfish infesting deepslate cause it to rotate.
|220024|Shader compilation slows or fails the more asterisks are in a multiline comment.
|220187|Hitbox of azalea and flowering azalea is incorrect.
|220190|When bone mealing moss blocks with no spreadable blocks nearby, they don't grow grass, bushes and moss carpets.
|220307|TrueType Font glyphs render incorrectly.
|220641|Loyalty tridents disappear when your inventory is full.
|220887|Shader includes fail to compile correctly when missing newline at end of file.
|221258|Cannot place sugar cane, bamboo and dead bushes on moss blocks.
|221628|Entities don’t stop glowing after losing the glowing effect.
|221652|{{cmd|Teleport}} command to player does not work as in previous versions.
|221655|Glow Squids and Axolotls Spawn in Monuments.
|222004|Grass block isn't in the <code>#dirt</code> block tag.
|222517|A large amount of slime or honey blocks will crash the game.
|222684|You cannot grow azalea trees by bonemealing Azalea plants.
|222778|<code>minecraft.used:minecraft.candle</code> doesn't increase when placing a candle on to a cake.
|;previous
|223260|Emerald ore does not generate as intended.
|223382|A marker's data tag can be shared among multiple markers.
|223553|<code>minecraft.used:minecraft.glow_ink_sac</code> doesn't increase when applying a glow ink sac to a sign.
|223554|<code>minecraft.used:minecraft.ink_sac</code> doesn't increase when applying an ink sac to a sign.
|223555|<code>minecraft.used:minecraft.COLOR_dye</code> doesn't increase when applying a dye to a sign.
|223557|<code>minecraft.used:minecraft.bucket</code> doesn't increase when taking powder snow, lava, or water from a cauldron using a bucket.
|223756|<code>minecraft.used:minecraft.powder_snow_bucket</code> doesn't increase when filling a cauldron with a powder snow bucket.
|223757|<code>minecraft.used:minecraft.lava_bucket</code> doesn't increase when filling a cauldron with a lava bucket.
}}</onlyinclude>

== Videos ==
{{slicedlime|4L09Z5rgHNM|AM0z--j5ee4}}

== References ==
{{Reflist}}

== Notes ==
{{Notelist}}

== Navigation ==
{{Navbox Java Edition versions|1.1x}}

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Minecraft:Java Edition 21w16a - Revision history

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