Changes for normal players

• Added very rare giant obelisks.
  • Decorated with a new "automata" block, which has some interesting interactions with redstone.
• Rivers now split up and take slightly different paths.
• Tweaked size and frequency of mega trees.
• Lakes are now larger and rarer.
• End fractal structures are now larger and rarer.
• Abandoned cities are now rarer.
• Fixed platform-typed skylands being extremely lopsided sometimes.
• Lapis ore now spawns in rivers, in addition to under oceans.
• Diamond, gold, and redstone ore are now more common.
• The player should no longer spawn inside or on top of structures, or inside a cave.
• Fixed /locate command being unable to find rivers.
• Fixed swamp wasteland biome not spawning in the world.
• Possibly fixed crash that could occur with some mods.
• Possibly fixed player being able to fly after leaving hyperspace when using Sinytra connector.
• Fixed budding quartz not dropping rough quartz.
• Performance improvements.

Changes for data pack makers

• Voronoi cells now have a center_column field, useful for querying column values at the center of the cell.
• Layers (not rock layers) can now once again be defined inline if desired.
• Structures are no longer limited to 17x17 chunks in size.
• Structure.terrainAdaptation is now exposed to scripts.

• Fixed animals not spawning more than 16 blocks above sea level.
• Fixed bugs in new old random switches (for data pack scripts).

Changes for normal players

• Added cave biomes.
• River biomes no longer appear in oceans.
• Axolotls now spawn in underground pockets. Due to vanilla logic, they only spawn when clay is below them. Not all underground pockets will have clay in them.
• Molten rock in the core no longer spawns randomly. Instead, it's a smoother gradient.
• Fixed saplings failing to grow outside of big globe worlds.
• Fixed a lot of blocks not breaking quickly with the proper tool.
• Fixed a few blocks dropping the wrong items.
• Fixed bees not spawning in beehives in 1.20.5 and later.

Changes for data pack makers

• Layers (the chunk generator kind, not the rock layer kind) have been split up into separate files. They are no longer in the world preset.
  • This makes it easier to tweak them, but also means any data pack which already did this will need to update.
• Added a "noop"-typed layer, which does nothing, and does not have any configurable properties.
  • This layer type is intended for when you want to remove a layer with a data pack.
• The molten_rock configured feature type has been removed.
• Added new mechanism for data packs to add mob spawns to the world without replacing biomes.
• Added new weighted random switch statement for scripts.