Minecraft Wiki
Minecraft 20w51a
Java Edition 20w51a.png

Java Edition



Release date

December 16, 2020

Snapshot for



Client (.json)

Obfuscation maps


Protocol version

 dec: 1073741833
 hex: 40000009

Data version


20w51a is the fifth snapshot for Java Edition 1.17, released on December 16, 2020, which adds axolotls, a gamerule to control when night is skipped when sleeping, makes changes to the sculk sensor, and fixes bugs.[1] This was the final snapshot released in 2020.



Bucket of Axolotl
  • Obtained by right-clicking on an axolotl while holding a water bucket.
Spawn Egg
  • Added axolotl spawn eggs.


  • Do not spawn naturally.
  • Are amphibious.
    • Will dry out and start taking damage after 5 minutes of being out of water.
  • Can be caught using a water bucket.
  • Are passive towards players.
  • Can be bred using tropical fish or buckets of tropical fish.
  • Come in five different colors: yellow, brown, white, pink, and blue.
    • Blue axolotls are very rare, with a 11200 chance of spawning.
  • May play dead when damaged, receiving Regeneration I.
  • Attack drowned, guardians, squid and fish.
    • Are always hostile to fish and squid, and hostile to drowned and guardians only when "tempted" by a player holding tropical fish.

Command format[]

/gamerule playersSleepingPercentage
  • Controls what percentage of players must sleep to skip the night.
  • When set to 0 or a negative value, a single player is sufficient to skip the night, and night is skipped immediately without the falling asleep transition.
  • When set over 100, the night cannot be skipped.
  • Set to 100 by default.


  • Added the axolotl_tempt_items item tag.
  • Added the occludes_vibration_signals item tag.
    • Contains the wool item tag.
    • As thrown entities, items in this tag do not trigger vibrations.
  • Added the axolotl_always_hostiles entity type tag.
    • Contains tropical fish, pufferfish, salmon, cod, and squid.
    • Axolotls are always hostile towards entities in this tag.
  • Added the axolotl_tempted_hostiles entity type tag.
    • Contains drowned and guardians.
    • Axolotls are hostile towards entities in this tag if they have been tempted.



Sculk sensor
  • "Eating Start" has been removed as an event.
  • Walking on wool no longer causes vibrations.
  • Throwing wool as an item on the ground no longer causes vibrations.
  • Sculk sensors are now silent while waterlogged.


  • When destroyed as an entity, it drops the items it currently has.
  • Changed interface:
    • Now shows two empty slots when not full, and a X when full.
    • The first item in a bundle is now highlighted.
Shulker boxes
  • Like bundles, they drop their items when destroyed as entities.


Resource packs
  • Bundle icons are now a separate texture.
  • Removed the eating_start game event from the vibrations game event tag.


15 issues fixed
From released versions before 1.17
  • MC-149799 – When a crossbow is loaded and in the offhand, you do not see it anymore if you carry an item in the main hand.
  • MC-176615 – It is possible to destroy netherite items with lava by putting them inside a container.
  • MC-207125 – Loaded crossbow in offhand does not show breaking block hand animation.
  • MC-207405 – Nether stars can be blown up while being inside of a bundle/shulker box.
  • MC-208082 – Game stalls when any message is displayed in chat while playing with an expired session.
From the 1.17 development versions
  • MC-203563 – Cake appears eaten for a split second when putting a candle on it.
  • MC-203568 – Trying to put a candle onto a candle cake duplicates the candle.
  • MC-204058 – Placing a candle on a cake causes hunger display desync.
  • MC-204146 – Netherite can burn whilst inside of a bundle.
  • MC-205057 – Bundle inventory preview is off-center inside of the tooltip box.
  • MC-205212 – Desync when putting a candle on a cake in Survival mode.
  • MC-206721 – The empty slot in the bundle tooltip should always be at the top left position.
From the previous development version
  • MC-207316 – Wool item entities trigger Sculk Sensors.
  • MC-207323 – Dripstones that extend to y level 0 don't fall.
  • MC-207404 – Walking on wool triggers sculk sensors.


Video made by slicedlime:


  • This snapshot was released on the second latest calendar out of all snapshots on December 16, only beaten by 15w51a and 15w51b on December 17.



  1. "Minecraft Snapshot 20w51a" – Minecraft.net, December 16, 2020