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20w51a is the 5th snapshot for Java Edition 1.17, released on December 16, 2020. It adds axolotls, makes many changes to the sculk sensor and fixes bugs. This is the last snapshot for 2020.[1]

Additions

Items

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

Mobs

Axolotl
  • Can be caught in a bucket, like fish.
    • Axolotls are passive towards players, and can be led around with tropical fish or a lead.
  • Come in different colors (yellow, brown, white, and pink, and a rare blue Axolotl).
  • Plays dead when damaged, receiving Regeneration I.
  • Grants temporary regeneration and removes Mining Fatigue when the player kills a mob that the axolotl was attacking or being attacked by.
    • (Due to a bug, this feature is non-functional.) [2]
  • Attacks drowned, guardians, elder guardians, squid and fish.
    • Always hostile to fish and squid , and hostile to drowned and guardians only when tempted with tropical fish. Hostility to elder guardians unconfirmed. <ref> MC-208647 <ref>
  • Can be bred using tropical fish.
  • Unable to spawn in Survival, only by using their spawn egg.

Command format

/gamerule playersSleepingPercentage
  • Controls what percentage of players must sleep to skip the night.
  • When set to 0, 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.

General

Tags
  • 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 will 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.

Changes

Blocks

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.

Items

Bundles
  • When destroyed, it drops the items it currently has.
Shulker boxes
  • Like bundles, they drop their items when destroyed.

General

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

Fixes

10 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
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-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

References

  1. "Minecraft Snapshot 20w51a" – Minecraft.net, December 16, 2020
  2. MC-208703
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