Java Edition 20w21a

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

General

 * 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
 * Disables the receiving and sending of online chat.
 * Disables the Multiplayer and Minecraft Realms buttons.
 * Disables the Multiplayer and Minecraft Realms buttons.
 * 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.


 * Subtitles
 * Added a 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.

Blocks

 * 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.

Items

 * Nether sprouts
 * Are now positioned in the center of the inventory slot as opposed to the bottom.

Mobs

 * 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.


 * Players
 * The  NBT key is now a namespaced dimension ID.

World generation

 * Mineral veins
 * 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.

Command format

 * Structure names are now specified as lowercase.
 * Structure names are now specified as lowercase.


 * Added the ability to control the height.
 * Syntax:
 * specifies the maximum height for resulting positions.
 * specifies the maximum height for resulting positions.

Gameplay

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

General

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


 * Splash and menu screens
 * Updated Mojang Studios and Minecraft logos.


 * NBT tags
 * The  NBT tag is now a namespaced ID string instead of a number.


 * Obsidian platform
 * Obsidian platform now can get regenerated 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 of "Blast furnace crackles" to "Blast Furnace crackles".
 * Changed the capitalization of "Enchanting table used" to "Enchanting Table used".
 * Changed the capitalization of "Respawn anchor is charged" to "Respawn Anchor is charged".
 * Changed the capitalization of "Respawn anchor depletes" to "Respawn Anchor depletes".
 * Changed the capitalization of "Respawn anchor sets spawn" to "Respawn Anchor sets spawn".
 * Changed the capitalization of "Turtle egg breaks" to "Turtle Egg breaks".
 * Changed the capitalization of "Turtle egg cracks" to "Turtle Egg cracks".
 * Changed the capitalization of "Turtle egg hatches" to "Turtle Egg hatches".
 * Removed the subtitle "Horse lands".


 * Tags
 * Removed wither roses from the block tag.


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

Video
Video made by slicedlime: