Java Edition 20w51a

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 "title": "Minecraft 20w51a",
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 "20w51a.jpg",
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 "field": "''(link to Java Edition article, displayed as Java Edition)''",
 "label": "(link to Edition article, displayed as Edition)"
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 {
 "field": "December 16, 2020",
 "label": "Release date"
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 {
 "field": "(link to Snapshot article, displayed as Snapshot)",
 "label": "(link to Version types article, displayed as Type)"
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 {
 "field": "(link to Java Edition 1.17 article, displayed as 1.17)",
 "label": "Snapshot for"
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 {
 "field": "[https://piston-data.mojang.com/v1/objects/ab0d1d122bc2c99daad33befe50a16a07d3b3bf7/client.jar Client] ([https://piston-meta.mojang.com/v1/packages/c0054db03e69292f3fccceb7a795b17791d9582d/20w51a.json .json])<br />[https://piston-data.mojang.com/v1/objects/fc87ef4c3cf1c815809249cc00ccade233b22cf5/server.jar Server]",
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 "label": "(link to Obfuscation map article, displayed as Obfuscation maps)"
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 "field": " <span style=\"font-size:smaller\"><abbr title=\"decimal\">dec</abbr>: </span>1073741833<br /> <span style=\"font-size:smaller\"><abbr title=\"hexadecimal\">hex</abbr>: </span>40000009",
 "label": "(link to Protocol version article, displayed as Protocol version)"
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 "label": "(link to Data version article, displayed as Data version)"
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 "field": "7",
 "label": "<span style=\"white-space: normal;\">(link to Pack format#List of pack formats article, displayed as Resource pack format)</span>"
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 "field": "7",
 "label": "<span style=\"white-space: normal;\">(link to Pack format#List of pack formats article, displayed as Data pack format)</span>"
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 "field": "<span class=\"plainlinks\">[https://en.wikipedia.org/wiki/Java_version_history#Java_SE_8_.28LTS.29 Java SE 8]</span>",
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 "footer": "<table style=\"margin: auto; word-break: break-word;\">\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\" >[[Java Edition 1.16.5|<span style=\"margin-right:-0.35em\">◄</span>◄  1.16.5]]</td>\n<td style=\"padding: 0.4em\">'''[[Java Edition 1.17|1.17]]'''</td>\n<td style=\"padding: 0.4em\" >[[Java Edition 1.17.1| 1.17.1 <span style=\"margin-right:-0.35em\">►</span>►]]</td>\n</tr>\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\">\n[[Java Edition 20w49a|◄  20w49a]]\n</td>\n<td style=\"padding: 0.4em\">''' 20w51a'''</td>\n<td style=\"padding: 0.4em\">\n[[Java Edition 21w03a| 21w03a ►]]\n</td>\n</tr>\n</table>"
}

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 is the final snapshot released in 2020.

👁 Image
Bucket of axolotl

• Obtained by right-clicking on an axolotl while holding a water bucket.

Spawn eggs

• 👁 Image
  Axolotl spawn egg

👁 Image
👁 Image
👁 Image
👁 Image
👁 Image
Axolotls

• 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 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.
• Leashed Axolotl begins walking at an exaggeratedly fast speed.

/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.

Tags

• Added the axolotl_tempt_items item tag.
  • Contains the tropical fish item and bucket of tropical fish.
  • Items in this tag can be used to tempt axolotls.
• 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 toward entities in this tag.
• Added the axolotl_tempted_hostiles entity type tag.
  • Contains drowned and guardians.
  • Axolotls are hostile toward 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.

Bundles

• 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.

Tags

• 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.

• 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.

• 👁 All of the Axolotl types that were added in this snapshot.
  
  All of the Axolotl types that were added in this snapshot.