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21w43a is the seventh snapshot for Java Edition 1.18, released on October 27, 2021.[1]

Additions

General

Old worlds upgrading
  • When generating close to old chunks hew terrain is adjusted to better match the existing terrain at the borderse
  • 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.
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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