{{Infobox version
|title=Minecraft 20w51a
|image=20w51a.jpg
|image2=Java Edition 20w51a.png
|edition=Java
|type=Snapshot
|date=December 16, 2020
|clienthash=ab0d1d122bc2c99daad33befe50a16a07d3b3bf7
|jsonhash=c0054db03e69292f3fccceb7a795b17791d9582d
|serverhash=fc87ef4c3cf1c815809249cc00ccade233b22cf5
|clientmap=1f4859972a54e7aeae1a35c76895f6e8ade33283
|servermap=204c6e7852f82489bed28825a58b4d8acbf386cc
|parent=1.17
|prevparent=1.16.5
|prev=20w49a
|next=21w03a
|nextparent=1.17
}}<onlyinclude>

'''20w51a''' is the fifth [[snapshot]] for [[Java Edition 1.17]], released on December 16, 2020, which adds [[axolotl]]s, a gamerule to control when night is skipped when sleeping, makes changes to the [[sculk sensor]], and fixes bugs.<ref>{{snap|20w51a|December 16, 2020}}</ref> This is the final snapshot to be released in 2020.

== Additions ==
=== Items ===
; [[File:Bucket of Axolotl JE1 BE1.png|32px]] [[Bucket of axolotl]]
* Obtained by right-clicking on an axolotl while holding a water bucket.

; [[Spawn egg]]s
* [[File:Axolotl Spawn Egg JE1 BE1.png|32px]] [[Axolotl spawn egg]]

=== Mobs ===
; {{Animate|Lucy Axolotl JE2 BE1.png; Wild Axolotl JE1.png; Gold Axolotl JE2.png; Cyan Axolotl JE2.png; Blue Axolotl JE2.png|32px}} [[Axolotl]]s
* Do not spawn naturally.
* Are amphibious.
** Dry out and start taking damage after 5 minutes of being out of water.
* Can be caught using a [[water bucket]].
* Are passive toward 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 {{frac|1|1200}} 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 ===
; {{cmd|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.

=== General ===
; [[Tag]]s
* Added the <code>axolotl_tempt_items</code> item tag.
** Contains the [[tropical fish]] item and [[bucket of tropical fish]].
** Items in this tag can be used to tempt axolotls.
* Added the <code>occludes_vibration_signals</code> item tag.
** Contains the wool item tag.
** As thrown entities, items in this tag do not trigger vibrations.
* Added the <code>axolotl_always_hostiles</code> entity type tag.
** Contains tropical fish, pufferfish, salmon, cod, and squid.
** Axolotls are always hostile towards entities in this tag.
* Added the <code>axolotl_tempted_hostiles</code> 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 ===
; [[Bundle]]s
* 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 box]]es
* Like bundles, they drop their items when destroyed as entities.

=== General ===
; [[Resource pack]]s
* [[Bundle]] icons are now a separate texture.

; [[Tag]]s
* Removed the <code>eating_start</code> game event from the <code>vibrations</code> game event tag.

== Fixes ==
{{fixes|fixedin=20w51a
|;old
|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.
|176615|It is possible to destroy netherite items with lava by putting them inside a container.
|207125|Loaded crossbow in offhand does not show breaking block hand animation.
|207405|Nether stars can be blown up while being inside of a bundle/shulker box.
|208082|Game stalls when any message is displayed in chat while playing with an expired session.
|;dev
|203563|Cake appears eaten for a split second when putting a candle on it.
|203568|Trying to put a candle onto a candle cake duplicates the candle.
|204058|Placing a candle on a cake causes hunger display desync.
|204146|Netherite can burn whilst inside of a bundle.
|205057|Bundle inventory preview is off-center inside of the tooltip box.
|205212|Desync when putting a candle on a cake in Survival mode.
|206721|The empty slot in the bundle tooltip should always be at the top left position.
|;previous
|207316|Wool item entities trigger Sculk Sensors.
|207323|Dripstones that extend to y level 0 don't fall.
|207404|Walking on wool triggers sculk sensors.
}}</onlyinclude>

== Video ==
{{slicedlime|7KtKxRi6TtI}}

== Trivia ==
* This snapshot was released on the third latest calendar out of all snapshots on December 16, beaten by [[23w51a]]/[[23w51b]] on December 18 and [[15w51a]]/[[15w51b]] on December 17.

== Gallery ==
<gallery>
Minecraft-snapshot-20w51a-axolotl.jpg|All of the Axolotl types that were added in this snapshot.
</gallery>

== References ==
{{Reflist}}

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

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