21w38a is the second snapshot for Java Edition 1.18, released on September 23, 2021,[1] which make more performance-related tweaks, reimplements telemetry, and fixes bugs, mostly relating to terrain changes that were accidentally removed in the previous snapshot.
Additions
General
- 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.
- Added a new subtitle for the crop sound of shears.
- Added
simulation-distance.
- 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
- Cannot be disabled. [2]
Changes
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
- Performance
- Now, various background tasks including world generation are executed on a background thread pool.
- The size of the thread pool equals
Amount of available CPU threads - 1.- Maximum amount of threads is 255, instead of 7. This limit can be overridden by Java system property
max.bg.threads.
- Maximum amount of threads is 255, instead of 7. This limit can be overridden by Java system property
- The size of the thread pool equals
- No longer reduced to walking when touching the wall at low angles.
Fixes
- 21 issues fixed
- From released versions before 1.18
- MC-44055 – Game fails to switch the audio output from one device to another from the title screen after the game has started.
- MC-128762 – Strongholds do not generate in ocean buffet worlds.
- MC-136288 – Strongholds don't generate in swamp biomes.
- MC-158410 – Strongholds don't generate in beach surface and snowy beaches buffet worlds.
- MC-183184 – Sprinting stops as soon as you touch another block.
- MC-202036 – Adding a biome to a datapack shifts biome IDs in existing chunks.
- From the previous development version
- MC-236611 – No sound for using shears on weeping, twisting, cave vines or kelp.
- MC-236618 – Strongholds don't generate in 21w37a.
- MC-236621 – Liquids sometimes do not propagate.
- MC-236633 – Random light level of 0 in sky.
- MC-236656 – Crash when changing render distance:
java.lang.ArrayIndexOutOfBoundsException: Index 28084 out of bounds for length 26136. - MC-236665 – Memory leak in 21w37a.
- MC-236682 – Large and continuous lag spikes sometimes occur when loading or reloading into a world in 21w37a.
- MC-236698 – Big spruce trees don't generate in groves.
- MC-236711 – Starting and stopping JFR profiling multiple times within the same minute overwrites previous JFR results saved during that minute.
- MC-236718 – Dripstone caves generate above the ground.
- MC-236753 – Caves and lakes generating too much in desert surface.
- MC-236795 – Cannot start with alternate JVM due to JFR requirement.
- MC-236873 – Problems with JFR event metadata.
- MC-236967 – Too many aquifers on biome surfaces at Y=63 and below.
- MC-237109 – Aquifers often generate with harsh straight borders.
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.
References
- ↑ "Minecraft Snapshot 21w38a" – Minecraft.net, September 23, 2021
- ↑ MC-237493 — resolved as "Works As Intended".