Minecraft Wiki
Minecraft 16w21a
Java Edition 16w21a.png

Java Edition



Release date

May 25, 2016

Snapshot for



Client (.json)

Protocol version


Data version


16w21a is the second snapshot for Java Edition 1.10, released on May 25, 2016,[1] which made minor changes to the behavior of blocks and items and fixed bugs.


Command format[]

NBT tags
  • FallFlying
    • Allows mobs to use elytra when they fall.
      • Mobs lose their ability to fly after touching the ground.



Bone blocks
  • No longer transparent.
  • Can now equip shields onto entities.
Rails (all types)
  • Bounding box for ascending rails is a full block (formerly only 532 of a block tall).
Structure blocks
  • No longer emit light.
  • Added "Structure Integrity and Seed" to load mode (NBT tags integrity and seed respectively).


Chorus fruits
  • Can now teleport riders from their mounts.
Ender pearls
  • Can now teleport riders from their mounts.
Fishing rods
  • Can now pull items to the player.


  • No longer despawn.

World generation[]

End portals
  • Now replace any blocks inside the portal frame ring when activating.
  • Blacksmiths now generate with cobblestone in all biomes (rather than acacia logs in savannas and sandstone in deserts).

Command format[]

NBT tags
  • IsVillager and VillagerProfession tags are now fully removed, replaced by the ZombieType first added in 16w20a.


  • fallingdust now can be summoned, making use of the params argument like blockcrack and several other particles do.
    • Example: /particle fallingdust ~ ~ ~ 0 0 0 0 1 0 @p 10 will summon a particle matching the color of lava (block ID 10).


25 issues fixed
From released versions before 1.10
  • MC-10046 – Random destination routine has a small statistical tendency to move more northwest (fix included).
  • MC-28424 – Untamed wolves and ocelots disappear.
  • MC-82425 – Insertion tag (tellraw) will not work on servers.
  • MC-84422 – No teleportation from any vehicle.
  • MC-93642 – XPOrb texture turns gray right before reaching player.
  • MC-93830 – Wolf tail height is not based on ratio of health to maxHealth.
  • MC-95910 – Unable to activate end portal with non-air blocks in the middle.
  • MC-95973 – Adult horse/donkey pathfinding Issue: 1 block elevations treated as 'non-traversable' terrain in certain configurations.
  • MC-96131/execute detect command causing entities within a chunk to be scoreboard reset.
  • MC-96269 – Skeletons, stray, witches, blazes, guardians and snowmen cannot shoot while in boats.
  • MC-97201 – Elytra stops working on relog.
  • MC-97526 – Signs, banners, skulls and chests are flashing when item spawner is nearby.
  • MC-97602 – Shift+clicking shield from inventory to shield slot.
  • MC-99945 – Cooked fish with numeric IDs not imported properly.
  • MC-101001 – Fishing rod cannot pull items.
  • MC-101680 – Batching chunks.
From the previous development version
  • MC-102052 – Structure blocks do not save properly.
  • MC-102068fallingdust Particle doesn't seem to work.
  • MC-102069 – Bone block is handled as a transparent block.
  • MC-102085 – Polar bears get stuck in standing position.
  • MC-102091 – Block hitbox/F3 crosshair issues.
  • MC-102103 – Savanna village blacksmith buildings burn themselves down.
  • MC-102125AreaEffectCloud with fallingdust particle crashes client "Exception while adding particle".
  • MC-102209 – Structure blocks melt snow.
  • MC-102238 – Surface-level abandoned mineshafts generate outside mesa and its variants.


Video made by slicedlime:


  • 16w21a was previously removed from the launcher for some time, but was added back in September 2018.