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.

Blocks

 * Redstone dust
 * Right-clicking an isolated redstone will toggle it between a cross and a dot.
 * A dot of redstone will not power surrounding blocks.
 * Redstone which is connected to anything will not be toggleable.

General

 * Custom worlds
 * Added experimental support for new custom worlds.
 * Edit world screen now has an option to export world settings to a JSON file.
 * During world creation you can import previously exported world settings.
 * A bunch of new parameters are exposed, but marked as experimental, meaning they can be used, but there is no guarantee that any of them will continue working.
 * This system breaks Flat levels structure settings, so structure settings were temporarily removed.
 * Java arguments
 * Disables the receiving and sending of online chat.
 * Disables the receiving and sending of online chat.


 * Disables the multiplayer button.
 * Disables the multiplayer button.


 * Settings
 * Added functionality to import/export world settings.


 * Sound events
 * Added a new sound event for foxes teleporting.

Items

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

Mobs

 * Piglins
 * No longer walk around when admiring gold.
 * If a piglin is hurt while admiring an ingot, the ingot will now disappear.

World generation

 * Ore generation
 * 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.
 * Added the ability to control the height.

General

 * Temporarily removed structure settings from flat level preset strings.
 * Updated Mojang logo.