Java Edition 20w21a

20w21a is the eighteenth snapshot for Java Edition 1.16, released on May 20, 2020,^[1] which adds experimental support for custom worlds and fixes bugs.

Customized worlds

• Added experimental support for new custom worlds.
• The "Edit World" menu now has an option to export world settings to a JSON file.
  • Previously exported world settings can be imported during world creation.
• Many new parameters are exposed but marked as experimental, meaning they can be used but may later be removed.

client.json arguments

• disableChat
  • Disables the receiving and sending of online chat.
• disableMultiplayer
  • Disables the "Multiplayer" and "Minecraft Realms" buttons.

Settings

• Added functionality to import/export world settings.

Sound events

• Added a new sound event for foxes teleporting after eating a chorus fruit.

Subtitles

• Added an unused^[2] subtitle for traveling through a nether portal, "Portal noise fades".
• Added a subtitle for activating a nether portal, "Portal noise intensifies".
• Added a subtitle for cat purring, "Cat purrs".
• Added a subtitle for donkey eating, "Donkey eats".
• Added a subtitle for fox teleporting, "Fox teleports".
• Added subtitles for mules neighing and eating; "Mule neighs" and "Mule eats", respectively.
• Added subtitles for parrots imitating hoglins, piglins, and zoglins; "Parrot growls", "Parrot snorts", and "Parrot growls", respectively.
• Added subtitles for zombies attacking and breaking wooden doors; "Door shakes" and "Door breaks", respectively.
• Added subtitles for using cartography tables, looms, and stonecutters; "Map drawn", "Loom used", and "Stonecutter used", respectively.
• Several of these subtitles do not show up in-game but are specified in sounds.json.

Redstone dust

• Right-clicking an isolated redstone toggles it between a cross and a dot.
  • A dot of redstone does not power surrounding blocks, and a cross does.
  • Redstone which is connected to anything is not toggleable.

Stems

• Now have a hardness of 1.

Nether sprouts

• Are now positioned in the center of the inventory slot as opposed to the bottom.

Piglins

• No longer walk around when admiring golden items.
• If a piglin is hurt while admiring a gold ingot, the ingot now disappears without completing a barter.

Ore blobs

• Increased the chance of ores to generate in the basalt deltas to balance against the reduced amount of netherrack in this biome.

World types

• Buffet worlds can no longer be created from server.properties.

/locate

• Structure names are now specified as lowercase.

/spreadplayers

• Added the ability to control the height.
  • Syntax: /spreadplayers <center> <spreadDistance> <maxRange> under <maxHeight> <respectTeams> <targets>
    • maxHeight specifies the maximum height for resulting positions.

Fishing

• Lily pads are now considered junk fishing loot rather than treasure.

Menu screens and splash

• Updated Mojang Studios and Minecraft logos.

NBT format

• The Dimension tag is now a resource location string instead of a number, which is used in player.dat.

Obsidian platform

• Now can regenerate when a non-player entity enters the End through an end portal.

Subtitles

• Changed the subtitle for zombie villagers converting from "Zombie vociferates" to "Zombie Villager vociferates".
• Changed the subtitle for zombie villagers being cured from "Zombie snuffles" to "Zombie Villager snuffles".
• Changed the capitalization:
  • "Blast furnace crackles" to "Blast Furnace crackles".
  • "Enchanting table used" to "Enchanting Table used".
  • "Respawn anchor is charged" to "Respawn Anchor is charged".
  • "Respawn anchor depletes" to "Respawn Anchor depletes".
  • "Respawn anchor sets spawn" to "Respawn Anchor sets spawn".
  • "Turtle egg breaks" to "Turtle Egg breaks".
  • "Turtle egg cracks" to "Turtle Egg cracks".
  • "Turtle egg hatches" to "Turtle Egg hatches".
• Removed the subtitle "Horse lands".

Superflat

• Removed structure settings from flat level preset strings as it was broken due to the addition of customizable worlds.

Tags

• Removed wither roses from the #prevent_mob_spawning_inside block tag.

Worlds

• Old customized worlds (from before Java Edition 1.13) now say "Old Customized" in the world selection screen.

45 issues fixed

From released versions before 1.16

• MC-51126 – Arrows disappear until the player relogs when they shoot them at low angles from a boat.
• MC-89361 – Player selectors fail finding player/Player is not correctly moved from the end to the nether.
• MC-91368 – Ender dragon taking damage from thorns in creative mode.
• MC-97247 – Map making sound uses equipment sound subtitles.
• MC-97507 – Using item which modifies the held item shows "Gear equips" subtitle.
• MC-107103 – Trying to interact with an entity 3 or more blocks away without seeing its eyes only interacts client-side.
• MC-113068 – Zombie banging on door subtitle is called "Block broken".
• MC-123155 – When any non-player entity enters an End portal the obsidian platform is not regenerated and the entity can fall into the void.
• MC-128658 – Nether and end biomes do not use correct blocks in Buffet world type.
• MC-147516 – Hostile mobs will sometimes stop attacking/following their target when directly next to it.
• MC-147691 – Enderman does not hit or damage the player if they keep standing still.
• MC-153319 – Result of UUID selector is nondeterministic.
• MC-166292 – Subtitle from foxes eating chorus fruit: "Player teleports".
• MC-167076 – Seagrass, sea pickles, and tall seagrass do not obscure direct sunlight when waterlogged.
• MC-169764 – Fish flopping sound shows both "Footsteps" and "Fish flops" subtitles.
• MC-177080 – Sounds for traveling through a portal have no subtitle.
• MC-177088 – Polar bear step sound does not have subtitles.
• MC-183249 – Carving mask BitSets created for lower chunk statuses.

From the 1.16 development versions

• MC-170930 – Nether sprouts item not visible when held in the hand in first person.
• MC-172090 – Piglins would rather hold a golden item instead of a crossbow.
• MC-172207 – Parrots do not imitate hoglins, zoglins, and piglins.
• MC-172255 – Piglins immediately dismount any entity that they are riding.
• MC-175656 – Piglins will keep gold ingots in their inventories if attacked while admiring them.
• MC-175989 – Strider sounds are not translated through in-game subtitles.
• MC-177438 – Turtle egg's name is inconsistently capitalized across different subtitles.
• MC-177830 – Blackstone and basalt prevent ancient debris and other Nether ores from generating.
• MC-178130 – Zombie villagers are called "Zombie" in some subtitles.
• MC-178212 – Nether planks, their variants, and hyphae are harder than stems.
• MC-178298 – Ancient debris and nether gold ore cannot generate in basalt deltas.
• MC-180257 – Crash when setting LodestonePos of compass to something other than NBT compound.
• MC-180852 – There is no space for the beacon's secondary power effects in the UI.
• MC-181270 – Trying to open old worlds (in Region format?) without version information in snapshots does not show a warning screen.
• MC-181298 – Game crashes when trying to generate a Nether biome superflat world with ruined portals.
• MC-181439 – Player or dispenser using a bucket at world height limit will play bucket sound despite failing.
• MC-181463 – The buttons are not selected in the right order using ↹ Tab in the new world creation menus.
• MC-181499 – Buckets cannot be emptied into a source block, but still produce a sound when trying.
• MC-181511 – Chunks with redstone are removed.
• MC-181522 – Chunks that have not been explored since 1.13 are resetting.
• MC-181535 – Placing water with a dispenser facing a water source drops the bucket.
• MC-181611 – Vindicators stop attacking the player when they are standing really close to them.
• MC-182514 – 15 block states per sub-chunk limit during world upgrade.
• MC-182743 – Wither skeletons do not spawn inside of wither roses.
• MC-182912 – Piglins still do not change their current crossbow for a new enchanted one.
• MC-183786 – Named seeds that are not numbers are not being recognized.

From the previous development version

• MC-183966 – Bonus chests generate on servers.