Java Edition 21w37a

21w37a is the first snapshot for Java Edition 1.18, released on September 15, 2021, which adds the contents of the previous experimental snapshots and brings more parity with.

Any old world can not be opened in this version, but it can before 1.18 released.

General

 * Commands
 * When enabled, begins profiling with Java FlightRecorder, as well as the following custom events:
 * minecraft.ServerTickTime: Sampling event exposing average server tick times in intervals of a second
 * minecraft.ChunkGeneration: Time taken to generate individual chunk stages
 * minecraft.PacketRead / minecraft.PacketSent: Network traffic
 * minecraft.WorldLoadFinishedEvent: Initial world loading duration
 * The profiling can be stopped in-game by using.
 * The profiling can be stopped in-game by using.


 * Font
 * Added, the rune-like font from Minecraft Dungeons.
 * Currently only usable via commands


 * Loot tables
 * Added the field, which is mandatory.
 * Written into to ensure that the tag can be migrated correctly between versions


 * Options
 * Can now disable lightning flashes, which prevents lightning from making the sky flash. Lightning bolts themselves will still appear.
 * The device the game outputs audio to can now be chosen in-game.
 * Added "Priority updates" to video settings.
 * Determines as to which chunk sections are updated synchronously in a single frame.
 * Three options:
 * nearby, which corresponds to how chunk sections were updated before 21w37a, and by player and none, which reduce stuttering when placing or removing blocks.
 * However, the latter two options may cause rare visual delays in world updates. These options also appear to be improperly capitalized.


 * Subtitles
 * Added subtitles for various bundle sounds.

Blocks

 * Enchanting table
 * Now emits a light level of 7.


 * Cave vines, kelp, twisting vines and weeping vines
 * Now stop growing if shears are used on the tip.
 * This action changes the  block state of the tip to 25.


 * Snow Block
 * Reverted change allowing plants to be placed on snow blocks.
 * This reversion results in the lack of vegetation in the grove biome.

Items

 * Elytra
 * Reverted durability changes from experimental snapshot 7.

Mobs

 * Axolotls
 * Now only spawn in lush caves.
 * Now have their own mob cap.


 * Vindicators, pillagers and evokers
 * Will not attack baby villagers anymore.


 * Goats
 * Now only spawn in snowy slopes, stony peaks, lofty peaks, and snow capped peaks biomes.

General

 * Options
 * The Sneak and Sprint, and Auto-jump options have been moved to the Controls tab.
 * Render distance now causes chunks to load in a cylinder shape around the player instead of a square.


 * Splashes
 * The splash "[this splash text has been delayed until part 2]" has been changed to "[this splash text is now available]".


 * Tags
 * Renamed the block tag to.


 * Other
 * Worlds last opened before Java Edition 1.2 can no longer be opened.
 * These worlds must be opened in a version prior to 21w37a (preferably between Java Edition 1.2 and Java Edition 1.6.4).
 * An error will be shown when attempting to open these worlds.
 * Worlds from before 21w37a currently cannot be opened, though this will change before 1.18 is released.
 * Removed length limits for scoreboards, score holders and team names.
 * Data pack format has been increased to 8.

Video
Videos made by slicedlime: