Minecraft 1.17 Caves & Cliffs – Snapshot 21w16a

22nd April 2021
Minecraft News
71 10

A Minecraft Java Snapshot

Snapshot 21w16a introduces some changes to azaleas and dripstone. On top of that, we’ve tweaked the textures of raw ores. There are also a few additions to the Caves & Cliffs preview datapack.


  • Azalea and Flowering Azalea can now be bonemealed to get an Azalea Trees
  • Added dripstone growth


  • If a stalactite is hanging from a dripstone block with a water source above, it will slowly grow both the stalactite from above and a stalagmite from below
  • Growth speed is random but very slow, a single growth step can take several minecraft days
  • A stalactite will only grow up to 7 blocks long
  • A stalactite will only cause stalagmite growth if the floor or stalagmite below is within 10 blocks
  • If the stalactite tip is inside water it won’t drip, and therefore won’t trigger any growth
  • If the stalagmite tip is inside water it won’t receive drops, and therefore won’t be grown by a dripping stalactite. Same thing if there is any fluid between the two tips
  • A stalagmite or stalactite will never grow into a fluid


  • Tweaked the texture of raw ores and raw ore blocks
A comparison between the textures of raw ores in snapshot 21w15a and snapshot 21w16a.

New raw ore textures in snapshot 21w16a. Click here for a link to the full resolution image.


Download the updated datapack here.

A lava aquifer.

A lava aquifer in snapshot 21w16a. Click here for a link to the full resolution image.

  • Aquifers below height 0 will sometimes be lava aquifers instead of water aquifers
  • Ore veins can now spawn underground


  • Ore veins are large, rare, snake-like underground ore formations
  • Copper veins form above height 0 and are mixed with granite
  • Iron veins form below height 0 and are mixed with tuff


  • Users who previously permanently declined server resource packs will now still be shown the pack prompt if the pack is mandatory (instead of being immediately disconnected)
  • The statistic for play time has been renamed to play_time
  • There is now a statistic for “Time with World Open” (total_world_time) that also includes the time when the game was paused


  • 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 is plantable counts towards using when right clicked on the ground
  • MC-190128 – Using a flint and steel to ingite TNT is not tracked by the in-game stats
  • 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-212113 – Glow Lichen can spawn underwater whilst not in a cave.
  • MC-212863 – Glow lichen use the same color as vines on maps
  • 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-215270 – Moss requires air above a replaceable block to spread
  • 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-218592 – Azalea trees can generate inside of lakes (even completely submerged in water)
  • MC-218614 – Inconsistency: Infested Deepslate can’t be placed along axis
  • MC-218637 – Inconsistency: Infested deepslate is not rotated randomly like normal deepslate
  • MC-219155 – Cast fishing line is disconnected from the rod
  • 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-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-221560 – Copper/Coal Ore in Deepslate Patches aren’t Deepslate Ores
  • 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 apart of 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 a cake
  • MC-223260 – Emerald ore does not generate as intended
  • 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-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-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


Snapshots are available for Minecraft: Java Edition. To install the snapshot, open up the Minecraft Launcher and enable snapshots in the “Installations” tab.

Snapshots can corrupt your world, so please backup and/or run them in a different folder from your main worlds.

Cross-platform server jar:

Report bugs here:

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source: https://www.minecraft.net/en-us/article/minecraft-snapshot-21w16a

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