Java Edition 21w39a

21w39a is the third snapshot for Java Edition 1.18, released on September 29, 2021, which add new advancements and fixes bugs.

Gameplay

 * Advancements
 * Added four new advancements:
 * Caves & Cliffs
 * Fall from top to bottom of the Overworld
 * Feels like home
 * Ride strider on lava for 50 blocks in the Overworld
 * Star Trader
 * Trade with a villager at the build height limit
 * Sound of Music
 * Play music with a jukebox in a meadow biome
 * Added new advancement triggers.
 * Triggered when a player lands after falling.
 * Triggered for every tick when player rides in lava.
 * Triggered for every tick when player rides in lava.
 * Triggered for every tick when player rides in lava.

Mobs

 * Drowned
 * Now can spawn in aquifers inside dripstone caves.
 * Zombie
 * No longer spawns in dripstone caves.

World generation

 * Mountains
 * The lone trees in Meadows now always contain a bee nest.

Technical

 * Chunk format
 * Chunk’s &  have moved to a container structure in.
 * Chunk’s are now paletted and live in a similar container structure in
 * Chunk’s is now  instead of


 * Loot tables
 * Added new loot table function.
 * Sets tag on any item


 * Server
 * now bundles individual libraries instead of merging all the files into single archive.
 * This change is meant to solve certain problems related to Java modules
 * On startup, will unpack libraries into a directory configured by  (default: working directory)
 * To run different main class than server, use property

General

 * Buried Treasures
 * Buried treasure chests can now contain water breathing potions.


 * Effects
 * Redesigned how effects look in the inventory screen.
 * The list of effects are now shown to the right of your inventory, instead of the left side.
 * When the inventory effects list is visible, it will be hidden from the game view to reduce screen clutter.
 * There’s now two modes of seeing the effect list: compact and classic:
 * Classic is the pre-existing list of effects, one after another.
 * Compact is a single icon for each effect, suitable for small screen estate.
 * The game will automatically switch between the two looks to suit the available screen estate.


 * inventory.png
 * now contains an extra sprite for a thin-layout version of the effect list in the inventory.


 * Options
 * Changed default brightness to 50.