Java Edition 21w37a

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 "title": "Minecraft 21w37a",
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 "field": "September 15, 2021",
 "label": "Release date"
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 "field": "(link to Snapshot article, displayed as Snapshot)",
 "label": "(link to Version types article, displayed as Type)"
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 {
 "field": "(link to Java Edition 1.18 article, displayed as 1.18)",
 "label": "Snapshot for"
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 "field": "[https://piston-data.mojang.com/v1/objects/be41b4e18f4a600365fd7a2b8eeac49232304ced/client.jar Client] ([https://piston-meta.mojang.com/v1/packages/7dfcb7bb54ac9e9b927627ef2a70d922543bb8bf/21w37a.json .json])<br />[https://piston-data.mojang.com/v1/objects/de695215d83f1f6ec5a19847f6178b84cfde7a26/server.jar Server]",
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 "field": " <span style=\"font-size:smaller\"><abbr title=\"decimal\">dec</abbr>: </span>1073741865<br /> <span style=\"font-size:smaller\"><abbr title=\"hexadecimal\">hex</abbr>: </span>40000029",
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 "label": "<span style=\"white-space: normal;\">(link to Pack format#List of pack formats article, displayed as Resource pack format)</span>"
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 "field": "<span class=\"plainlinks\">[https://en.wikipedia.org/wiki/Java_version_history#Java_SE_16 Java SE 16]</span>",
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 "invimages": [],
 "footer": "<table style=\"margin: auto; word-break: break-word;\">\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\" >[[Java Edition 1.17.1|<span style=\"margin-right:-0.35em\">◄</span>◄  1.17.1]]</td>\n<td style=\"padding: 0.4em\">'''[[Java Edition 1.18|1.18]]'''</td>\n<td style=\"padding: 0.4em\" >[[Java Edition 1.18.1| 1.18.1 <span style=\"margin-right:-0.35em\">►</span>►]]</td>\n</tr>\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\">\n[[Java Edition 1.18 experimental snapshot 7|◄  1.18 experimental snapshot 7]]\n</td>\n<td style=\"padding: 0.4em\">''' 21w37a'''</td>\n<td style=\"padding: 0.4em\">\n[[Java Edition 21w38a| 21w38a ►]]\n</td>\n</tr>\n</table>"
}

21w37a is the first non-experimental snapshot for Java Edition 1.18, released on September 15, 2021,^[2] which adds the contents of the previous seven experimental snapshots and brings more parity with Bedrock Edition.

Commands

• /jfr
  • When enabled, begins profiling with Java FlightRecorder, as well as the following custom events:
    • minecraft.ServerTickTime: Sampling event exposing average server tick times in intervals of a second
    • minecraft.ChunkGeneration: Time taken to generate individual chunk stages
    • minecraft.PacketRead / minecraft.PacketSent: Network traffic
    • minecraft.WorldLoadFinishedEvent: Initial world loading duration
  • The profiling can be stopped in-game by using /jfr stop.

Font

• Added illageralt, the rune-like font from Minecraft Dungeons.
  • Currently only usable via commands

Loot tables

• Added the type field, which is mandatory.
  • Written into BlockEntityTag.id to ensure that the tag can be migrated correctly between versions.

Options

• Can now disable lightning flashes, which prevents lightning from making the sky flash. Lightning bolts themselves still appear.
• The device the game outputs audio to can now be chosen in-game.
• Added "Priority updates" to video settings.
  • Determines as to which chunk sections are updated synchronously in a single frame.
  • Three options:
    • nearby, which corresponds to how chunk sections were updated before 21w37a, by player and none, which reduce stuttering when placing or removing blocks.
    • However, the latter two options may cause rare visual delays in world updates. These options also appear to be improperly capitalized.^[3]

Subtitles

• Added subtitles for various bundle sounds.

Enchanting table

• Now emits a light level of 7.

Cave vines, kelp, twisting vines and weeping vines

• Now stop growing if shears are used on the tip.
  • This action changes the age block state of the tip to 25.

Snow block

• Reverted change allowing plants to be placed on snow blocks.
  • This reversion results in the lack of vegetation in the grove biome.

Bundle

• Has been removed from the creative inventory once again.
• Can once again no longer be crafted.
• Only accessible through commands once again.

Crossbow

• Durability has been increased to 465.

Elytra

• Reverted changes from experimental snapshot 7.

Axolotls

• Now have their own mob cap.
• Now avoid lava.

Vindicators, pillagers, and evokers

• Don't attack baby villagers anymore.

Goats

• Now only spawn in snowy slopes, stony peaks, lofty peaks, and snow capped peaks biomes.

Rabbits

• Can now spawn on snow blocks.

Feedable mobs

• All feedable mobs (except sheep) named "Dinnerbone" now look at the player correctly.

General

• Reverted changes of spawners from experimental snapshot 2.

Stone shores

• Changes of diorite, andesite, or granite generated as strips in experimental snapshot 4 is reverted.

Stony peaks

• Changes of andesite, granite and gravel generated as strips in experimental 4 is reverted.

Data packs

• Version number has been increased to 8.

Options

• Sneak, sprint, and auto-jump options have been moved to the "Controls" menu.
• Render distance now causes chunks to load in a cylinder shape around the player instead of a square.

Scoreboards

• Removed length limits for scoreboards, score holders and team names.

Splashes

• The splash "[this splash text has been delayed until part 2]" has been changed to "[this splash text is now available]".

Tags

• Renamed the lava_pool_stone_replaceables block tag to lava_pool_stone_cannot_replace.

Other

• Worlds last opened before Java Edition 1.2 can no longer be opened.
  • These worlds must be opened in a version prior to 21w37a (preferably between Java Edition 1.2 and Java Edition 1.6.4).
  • An error is shown when attempting to open these worlds.

69 issues fixed

From released versions before 1.18

• MC-7200 – Cave/tunnel generation may cut tunnels a bit too soon.
• MC-29274 – Withers will not pursue players in survival mode unless attacked.
• MC-30560 – River through eroded badlands biome generates floating rock formations at water surface.
• MC-54545 – Client render distance doesn't adjust to server render distance if they are different, causing faulty chunk loading.
• MC-65628 – Desert pyramids generate underground when using amplified or custom terrain.
• MC-72831 – Water lakes can generate in deserts.
• MC-85975 – Slimes don't spawn in the swamp hills biome.
• MC-101917 – Andesite, diorite and granite won't generate above a height of about 80.
• MC-123277 – Too long scoreboard objectives and team names are not detected when commands are parsed.
• MC-125033 – Old cave and ravine generation gets cut off unnaturally on chunk borders near water.
• MC-126133 – Undercover ravines sometimes generate cut off at chunk borders.
• MC-129266 – Jagged ocean transitions and slower biome generation.
• MC-132175 – Beaches generate along swamp hills when bordering an ocean.
• MC-132429 – Sand beaches generate when bordering gravelly mountains biomes.
• MC-134407 – Ocean ravines spawning underground with a stone roof on top.
• MC-138801 – The interactions between a biome and another biome and its variants are inconsistent.
• MC-140151 – Modified jungle edge biomes only generate when a jungle borders a swamp hills biome.
• MC-140690 – Giant spruce taiga hills have no difference with giant spruce taiga.
• MC-159025 – Drowned do not spawn in warm ocean biomes.
• MC-160710 – Chat messages written while sleeping are deleted after waking up.
• MC-166238 – Trees can generate on mycelium.
• MC-166423 – Splash water bottles don't damage endermen.
• MC-167277 – Swamp hills don't naturally generate seagrass.
• MC-167800 – Rabbits do not spawn on snow block, podzol and coarse dirt.
• MC-175929 – Ice spikes get cut off below height limit on AMPLIFIED worlds.
• MC-182362 – Score callbacks with a too long name break callback chain.
• MC-186042 – Plains biome is always generated when a swamp borders a desert, snowy tundra or snowy taiga.
• MC-188096 – Gravelly mountains+ is no different than gravelly mountains.
• MC-190363 – Some biomes generate as "Single biome" worlds in "Floating islands" world type.
• MC-199298 – Strongholds don't generate in bamboo jungles.
• MC-200230 – Anomalous stripes/grid ice generation in frozen ocean biome.
• MC-202376 – Rabbits, instead of spawning on snow blocks, spawn on snow layers.
• MC-208352 – Dark forest hills don't generate small patches of plains or sunflower plains, but dark forest does.
• MC-208353 – Several hills biomes do not generate sporadically replacing patches of their regular biome counterparts.
• MC-208601 – Axolotls do not avoid danger when pathfinding.
• MC-212113 – Glow lichen can spawn underwater whilst not in a cave.
• MC-213779 – FPS drops when looking up in a tall world (4064 blocks).
• MC-214335 – Flower forest is much steeper than regular forest.
• MC-214783 – Oceans generate with stone floors.
• MC-214797 – Pointed dripstone can generate floating at transitions between local water levels.
• MC-214799 – Aquifers sometimes create air pockets.
• MC-214864 – Hard edges when new caves generate near surface.
• MC-215062 – Weird aquifer barrier generator and water in incorrect states.
• MC-215296 – Mineshafts often don't generate in floating island worlds.
• MC-215876 – Dirt can generate below Y=0 from mineshafts.
• MC-216362 – Jukeboxes that have been placed don't stack with jukeboxes that have not been placed.
• MC-216448 – River generates over a ravine.
• MC-216784 – Ruined portals don't generate below Y=0.
• MC-216952 – Some chunks interrupting with cave systems filled with blocks.
• MC-216967 – Kelp and seagrass can generate in aquifers.
• MC-217136 – Random noise pillars generating mid air.
• MC-217465 – Unnatural shape looking like a chunk border but appears to be completely unrelated to chunk borders.
• MC-217509 – Inefficient generation of aquifers, noise caves and ore veins.
• MC-219774 – Magma blocks spawn everywhere underwater in 21w10a.
• MC-219946 – Weird flat sections of terrain.
• MC-221679 – End fog loses its gradient when under Y=0.
• MC-221777 – Horses, donkeys, mules, llamas, and trader llamas do not follow players holding food.
• MC-221815 – Flat roofs in underwater caves.
• MC-221917 – Dripstone, pointed dripstone, and cave magma generate in oceans.
• MC-222051 – Iron ore generation was not increased in 21w13a.
• MC-222379 – Magma can spawn under air in underwater caves.
• MC-223044 – Floating water can generate in ravines.
• MC-223051 – Dripstone can generate in surface lakes.
• MC-223148 – Extended height message goes behind the scrolling bar.
• MC-225781 – The noise cave lava level and the cave carver lava level generate 1 block apart.
• MC-227244 – Ore blocks from ore veins float in underwater magma ravines.
• MC-230343 – Parity issue: Enchanting tables do not emit a light level of 7.
• MC-231863 – Game crashes when trying to access the Realms settings.
• MC-233050 – #lava_pool_stone_replaceables tag name is misleading.