Java Edition 21w40a

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21w40a is the fourth snapshot for Java Edition 1.18, released on October 7, 2021,^[2] that merges and renames some biomes, tweaks world generation, mob spawning, and fixes bugs.

Copper ore

• Now drop 2-5 raw copper when mining instead of 2-3.

Stonecutter

• Block of copper can be converted to 4 cut copper using stonecutter.

Axolotls

• Now only spawn in water above clay blocks in lush caves.

Cod, salmon, pufferfish, tropical fish, squid, and dolphins

• Now only spawn in water from Y=50 to Y=64.
• Additionally, tropical fishes now also spawn in lush caves at any height.

Glow squids

• Now only spawn in water blocks under Y=30.

Goats

• No longer spawn in stony peaks.

Zombies

• Now also spawn in dripstone caves again.

Biomes

• The unused height variation sub-biomes have been removed from the code and merged with their default biome variants, as following:

Removed biomes
👁 Image Badlands Plateau
👁 Image Bamboo Jungle Hills
👁 Image Birch Forest Hills
👁 Image Dark Forest Hills
👁 Image Desert Hills
👁 Image Desert Lakes
👁 Image Giant Spruce Taiga Hills
👁 Image Giant Tree Taiga Hills
👁 Image Gravelly Mountains+
👁 Image Jungle Hills
👁 Image Modified Badlands Plateau
👁 Image Modified Jungle
👁 Image Modified Jungle Edge
👁 Image Modified Wooded Badlands Plateau
👁 Image Mountain Edge
👁 Image Mushroom Field Shore
👁 Image Shattered Savanna Plateau
👁 Image Snowy Mountains
👁 Image Snowy Taiga Hills
👁 Image Snowy Taiga Mountains
👁 Image Swamp Hills
👁 Image Taiga Hills
👁 Image Taiga Mountains
👁 Image Tall Birch Hills
👁 Image Wooded Hills

• Some biomes have been renamed:

Old name	New name
Giant Spruce Taiga	👁 Image Old Growth Spruce Taiga
Giant Tree Taiga	👁 Image Old Growth Pine Taiga
Gravelly Mountains	👁 Image Windswept Gravelly Hills
Jungle Edge	👁 Image Sparse Jungle
Lofty Peaks	👁 Image Jagged Peaks
Mountains	👁 Image Windswept Hills
Shattered Savanna	👁 Image Windswept Savanna
Snowcapped Peaks	👁 Image Frozen Peaks
Snowy Tundra	👁 Image Snowy Plains
Stone Shore	👁 Image Stony Shore
Tall Birch Forest	👁 Image Old Growth Birch Forest
Wooded Badlands Plateau	👁 Image Wooded Badlands
Wooded Mountains	👁 Image Windswept Forest

• Non-cave biomes (e.g. savannas) no longer change with height.
• Tweaked the relative size of some biomes, to match 1.17 a bit closer.
• Increased the average size of most biomes.

Ore distribution

• Copper ore now generates between Y=-16 and Y=112, generating the most at Y=48, and increased the number of ore blobs.
• Added more unexposed diamonds.
• Decreased minimum generation height of emerald ore from Y=32 to Y=-16, and increased the number of blobs.
  • This allows deepslate emerald ore to generate again.
• Extra gold generates below Y=-48.
• Decreased minimum generation height of the upper range of iron ore from Y=112 to Y=80, and increased the number of blobs.

Monster rooms

• Increased the amount of monster rooms, especially below Y=0.

Gravel

• Now generates below Y=0, and increased the number of blobs.

Lakes

• Water lakes were removed, because aquifers could provide local water levels.

Magma blocks

• Slightly increased the frequency of underwater magma.

Villages

• Now slightly more spread out.

General

• Bedrock layers generate dependent on the world seed now.

Advancements

• Due to the removal or merging of sub-biomes, the number of biomes required to visit for the "Adventuring Time" advancement has been reduced from 42 to 31, with the following biomes now being required:

Required biomes
👁 Image Badlands
👁 Image Bamboo Jungle
👁 Image Beach
👁 Image Birch Forest
👁 Image Cold Ocean
👁 Image Dark Forest
👁 Image Deep Cold Ocean
👁 Image Deep Frozen Ocean
👁 Image Deep Lukewarm Ocean
👁 Image Desert
👁 Image Forest
👁 Image Frozen River
👁 Image Jungle
👁 Image Lukewarm Ocean
👁 Image Mushroom Fields
👁 Image Old Growth Pine Taiga
👁 Image Plains
👁 Image River
👁 Image Savanna
👁 Image Savanna Plateau
👁 Image Snowy Beach
👁 Image Snowy Plains
👁 Image Snowy Taiga
👁 Image Sparse Jungle
👁 Image Stony Shore
👁 Image Swamp
👁 Image Taiga
👁 Image Warm Ocean
👁 Image Windswept Forest
👁 Image Windswept Hills
👁 Image Wooded Badlands

AI

• Optimized AI for axolotls, goats, hoglins, zoglins, piglins, piglin brutes and villagers.

47 issues fixed

From released versions before 1.18

• MC-128770 – Woodland mansions still generate in dark forest hills.
• MC-132306 – Snowy grass without snow near lakes in snowy biome.
• MC-133582 – Dolphins try to catch up with boat on land.
• MC-137140 – Llamas cannot spawn in shattered savanna plateau.
• MC-137956 – Lakes still generate in superflat preset "Overworld" after removing its tag.
• MC-138734 – Spawn point for seed 0, world type Buffet with badlands plateau biome is under surface, ⇒ player dies.
• MC-138782 – Stranded dolphin tries to catch the boat on the water and stops beating.
• MC-138939 – Fish and dolphins spawn in water above sea level.
• MC-152966 – Increase in villages generating in versions after 1.10.
• MC-169523 – As of 18w06a, the sand, clay and gravel blocks no longer generate around small lakes.
• MC-177016 – Some lakes in frozen biomes generate unfrozen.
• MC-190724 – Spawning in solid blocks in single biome "Badlands Plateau" world.
• MC-197688 – Mountain edge never generates.
• MC-200640 – Despite being a coastal biome, mushroom field shores don't have a warm/unique water color.
• MC-200803 – Gravelly mountains+/modified gravelly mountains placed incorrectly in the biome selection.
• MC-217906 – Large amounts of axolotls cause performance issues.
• MC-224494 – Regular dirt can generate naturally on the surface near pools.
• MC-225030 – Dungeons are extremely rare compared to in the past.
• MC-225506 – Grass blocks can generate naturally in underground pools.
• MC-225842 – Flowers can generate on large plants near lakes.
• MC-225858 – Seeds and flowers appear in ponds.
• MC-226000 – Pointed dripstone items in underground pools.
• MC-226437 – Water lakes generating in snowy tundra's can sometimes contain dark spots.
• MC-226682 – World can fail to render/load causing visual issues.
• MC-227064 – Floating grass can still generate above water lakes.
• MC-229365 – Large amounts of goats cause performance issues.
• MC-231400 – Modified badlands plateau and mountain edge don't generate and gives out invalid biome data in single biome worlds.
• MC-233661 – In some cases, sand blocks generating over lakes do not cause light updates, resulting in large dark spots.
• MC-238006 – Emerald ore and infested blocks do not generate in snowy mountain biomes.

From the 1.18 development versions

• MC-236609 – New mountain biomes use translations strings in biome selection.
• MC-236614 – Adventuring Time advancement still accepts non generating biomes.
• MC-236617 – Mountains and gravelly mountains use their 1.17.1 biome ID name.
• MC-236632 – Banners without patterns do not render properly.
• MC-236663 – Command blocks do not display command in their UI.
• MC-236736 – No relief on treasure map or explorer maps.
• MC-236894 – Foliage from specific biomes can generate in biomes they aren't meant for.
• MC-236896 – Strange mini broken aquifer walls generating commonly on the surface.
• MC-237490 – The bottom parts of aquifers aren't always surrounded by blocks which can occasionally cause them to spill into caves in ways that appear bizarre.
• MC-237586 – Entities that die outside of simulation distance remain frozen in the death animation.
• MC-237666 – Unused biomes still present in game files.

From the previous development version

• MC-237925 – Opening world from 1.12.2 (or older) in latest snapshot regenerates random chunks.
• MC-237933 – Sweet berries generate much too often.
• MC-237950 – Cave vines can generate without tip because prioritize_tip option is negated.
• MC-237951 – Cave vines can generate into water.
• MC-237962 – Entities bob their head up and down when targeting towards the player.
• MC-238104 – Blue orchid generation has decreased.
• MC-238265 – version.json contains internal revision ID instead of game version ID.

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