Java Edition 21w38a

21w38a is the second snapshot for Java Edition 1.18, released on September 23, 2021, which make more performance-related tweaks, reimplements telemetry, and fixes bugs, mostly relating to terrain changes that didn't make it into the last snapshot.

General

 * Languages
 * Added two new languages called "Lombard" and "Toki Pona".


 * Options
 * Added "Simulation Distance" video setting, a new slider.
 * Entities will not be updated outside of simulation distance.
 * Allows higher render distance with less CPU load.


 * Subtitles
 * Added a new subtitle for the crop sound of shears.


 * server.properties
 * Added.

Technical

 * Telemetry
 * Readded, previously a part of game known as "snooper" until 18w20c.
 * Only implemented in world load event now.
 * Sent data when loading singleplayer world or connecting to multiplayer server.
 * Contains following information:
 * Launcher identifier
 * User identitifer (XUID)
 * Client session ID (changes on restart)
 * World session ID (changes per world load, to be reused for later events)
 * Game version
 * Operating system name and version
 * Java runtime version
 * If client or server is modded (same information as on crash logs)
 * Server type (single player, Realms or other)
 * Game mode

World generation

 * Ore distribution
 * Copper Ore now generates up to Y=95, and increased its amount.
 * Lapis Lazuli Ore now generates in blobs, like other ores, instead of spread out.

General

 * Sprinting
 * No longer reduced to walking when gently brushing your sleeve against a wall.

Technical

 * Performance
 * Now, various background tasks including world generation are executed on a background thread pool.
 * The size of the thread pool equals.
 * Maximum amount of threads is 255, instead of 7. This limit can be overridden by Java system property.

Video
Videos made by slicedlime:

Trivia

 * Unlike most of the first-of-the-week snapshots, this was released on a Thursday instead of Wednesday, similar to the snapshots before 14w26a.
 * Worlds from previous versions cannot be opened in this version.