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 a piece of redstone will toggle it between a cross and a dot.
 * A dot of redstone will not power surrounding blocks.

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
 * Flat level preset string lost structure settings


 * 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.