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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

General

Old worlds upgrading
  • When generating close to old chunks hew terrain is adjusted to better match the existing terrain at the borders.
  • The old bedrock layer between Y=0 and Y=4 in old chunks gets replaced with Deepslate
    • Worlds upgraded in this snapshot will permanently have this deepslate.
  • A new Bedrock layer is placed at Y=-64

Changes

General

Chunk format
  • Removed chunk’s Level and moved everything it contained up.
  • Chunk’s Level.Entities has moved to entities.
  • Chunk’s Level.TileEntities has moved to block_entities.
  • Chunk’s Level.TileTicks and Level.ToBeTicked have moved to block_ticks.
  • Chunk’s Level.LiquidTicks and Level.LiquidsToBeTicked have moved to fluid_ticks.
  • Chunk’s Level.Sections has moved to sections.
  • Chunk’s Level.Structures has moved to structures.
  • Chunk’s Level.Structures.Starts has moved to structures.starts.
  • Chunk’s Level.Sections[].BlockStates and Level.Sections[].Palette have moved to a container structure in sections[].block_states.
  • Chunk’s Level.Biomes are now paletted and live in a similar container structure in 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.
General
  • Some internal details of block and fluid ticking have been changed to improve save times.

Fixes

8 issues fixed
From released versions before 1.18
  • 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-238073 – Decorators are independent of world seed.
From the 1.18 development versions
  • 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.
From the previous development version
  • MC-239397 – Lava pockets generate in icebergs.

References

  1. "Minecraft Snapshot 21w43a" – Minecraft.net, October 27, 2021
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