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21w43a is the seventh snapshot for Java Edition 1.18, released on October 27, 2021,[1] which adds the old world upgrading and fixes bugs.

Additions[]

Biome Blending

Biome blending in action.

World generation[]

Upgrading of old worlds
  • Terrain from new chunks will now blend with existing terrain from old chunks, preventing glitched borders from occurring.
  • The old bedrock layer between Y=0 and Y=4 in old chunks gets replaced with deepslate.
  • If there is bedrock at Y=0, lower places in old chunks will be filled with deepslate.
    • Caves do not generate below Y=0 in old chunks but lava lakes and geodes may generate.
  • A new bedrock layer is placed at Y=-64.
  • Worlds upgraded in this snapshot have these changes permanently applied.

General[]

Tags

Changes[]

Blocks[]

Big Dripleaf

World generation[]

Aquifers
  • Water levels change less often (slightly fewer underground waterfalls).
  • Lava aquifers are slightly less common.
Caves
  • Reduced the amount of flooded caves near river and ocean coastlines.
Ocean
Seeds
  • Have been reshuffled again. Worlds will not look like as they did in previous snapshots.[2]

General[]

Chunk format
  • Removed chunk’s Level and moved everything it contained up.
    • Level.Entities has moved to entities.
    • Level.TileEntities has moved to block_entities.
    • Level.TileTicks and Level.ToBeTicked have moved to block_ticks.
    • Level.LiquidTicks and Level.LiquidsToBeTicked have moved to fluid_ticks.
    • Level.Sections has moved to sections.
    • Level.Structures has moved to structures.
    • Level.Structures.Starts has moved to structures.starts.
    • Level.Sections[].block_states has moved to sections[].block_states.
    • Level.Sections[].biomes has moved to sections[].biomes.
  • Added yPos the minimum section y position in the chunk.
  • Added below_zero_retrogen containing data to support below zero generation.
  • Added blending_data containing data to support blending new world generation with existing chunks.
Options
  • The Priority Updates video setting has been renamed to Chunk Builder, added tooltips to its three options, and renamed them:
    • "nearby" renamed to "Fully Blocking".
    • "by player" renamed to "Semi Blocking".
    • "none" renamed to "Threaded".
Tick
  • Changed some internal details of block and fluid ticking to improve save times.

Fixes[]

11 issues fixed
From released versions before 1.18
  • MC-49010 – Cloning pressure plates or buttons whilst they're activated keeps them pressed forever.
  • MC-131930 – Deep warm ocean generates without coral and sea pickles.
  • MC-156616 – Badlands layers not generating properly.
  • MC-217379 – Pufferfish don't spawn in deep warm ocean.
  • MC-224205 – Cloned big dripleaves remain tilted forever when their tilt value is not equal to "none".
  • MC-228745 – Big dripleafs can't be supported by farmland.
  • MC-238073 – Decorators are independent of world seed.
From the 1.18 development versions
  • MC-236615 – Priority updates setting has improper capitalization.
  • MC-236624 – Deep warm oceans don't count towards the "Adventuring Time" advancement.
  • MC-236970 – Badlands strata is covered by orange terracotta at Y=160 and above.
  • MC-238939 – Stone can generate in the Nether.

Video[]

Video made by slicedlime:

References[]

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