Java Edition 20w45a

{
 "title": "Minecraft 20w45a",
 "images": [
 "20w45a.png",
 "Java Edition 20w45a.png"
 ],
 "rows": [
 {
 "field": "''(link to Java Edition article, displayed as Java Edition)''",
 "label": "(link to Edition article, displayed as Edition)"
 },
 {
 "field": "November 4, 2020",
 "label": "Release date"
 },
 {
 "field": "(link to Snapshot article, displayed as Snapshot)",
 "label": "(link to Version types article, displayed as Type)"
 },
 {
 "field": "(link to Java Edition 1.17 article, displayed as 1.17)",
 "label": "Snapshot for"
 },
 {
 "field": "[https://piston-data.mojang.com/v1/objects/cf2cd62dfc63fc1a79061a3964d82bf26e0fd208/client.jar Client] ([https://piston-meta.mojang.com/v1/packages/61d57da4d2ac5833d19feab0d3a286237ca496dc/20w45a.json .json])<br />[https://piston-data.mojang.com/v1/objects/043ec38297d0ec58abd6f636bc92f5664a8ccecb/server.jar Server]",
 "label": "(link to Tutorial:Installing a version#Manual version installation article, displayed as Downloads)"
 },
 {
 "field": "[https://piston-data.mojang.com/v1/objects/ce69af77a39c4e1802b1aebac2f86d867bd71c5c/client.txt Client]<br />[https://piston-data.mojang.com/v1/objects/e13520140ed6bdbe2ca05f59ce12700e9081a8cf/server.txt Server]",
 "label": "(link to Obfuscation map article, displayed as Obfuscation maps)"
 },
 {
 "field": " <span style=\"font-size:smaller\"><abbr title=\"decimal\">dec</abbr>: </span>1073741829<br /> <span style=\"font-size:smaller\"><abbr title=\"hexadecimal\">hex</abbr>: </span>40000005",
 "label": "(link to Protocol version article, displayed as Protocol version)"
 },
 {
 "field": "2681",
 "label": "(link to Data version article, displayed as Data version)"
 },
 {
 "field": "7",
 "label": "<span style=\"white-space: normal;\">(link to Pack format#List of pack formats article, displayed as Resource pack format)</span>"
 },
 {
 "field": "6",
 "label": "<span style=\"white-space: normal;\">(link to Pack format#List of pack formats article, displayed as Data pack format)</span>"
 },
 {
 "field": "<span class=\"plainlinks\">[https://en.wikipedia.org/wiki/Java_version_history#Java_SE_8_.28LTS.29 Java SE 8]</span>",
 "label": "<span style=\"white-space: normal;\">Minimum Java version</span>"
 }
 ],
 "invimages": [],
 "footer": "<table style=\"margin: auto; word-break: break-word;\">\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\" rowspan=\"2\">[[Java Edition 1.16.5|<span style=\"margin-right:-0.35em\">◄</span>◄  1.16.5]]</td>\n<td style=\"padding: 0.4em\">'''[[Java Edition 1.17|1.17]]'''</td>\n<td style=\"padding: 0.4em\" >[[Java Edition 1.17.1| 1.17.1 <span style=\"margin-right:-0.35em\">►</span>►]]</td>\n</tr>\n<tr style=\"background: inherit;\">\n\n<td style=\"padding: 0.4em\">''' 20w45a'''</td>\n<td style=\"padding: 0.4em\">\n[[Java Edition 20w46a| 20w46a ►]]\n</td>\n</tr>\n</table>"
}

20w45a is the first snapshot for Java Edition 1.17, released on November 4, 2020,^[1] which adds the first Caves & Cliffs features.

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Amethyst bud

• Grows from budding amethyst, which is found in amethyst geodes.
• Starts out small, but grows into medium after a while, large after even more time and eventually becomes an amethyst cluster.
• Unlike crops, each growth stage is a separate block instead of a block state.
• Drops nothing if broken in its premature stages, even with Silk Touch.

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Amethyst cluster

• The final, mature stage of the amethyst bud, which grows from budding amethyst in amethyst geodes.
• Drops amethyst shards if broken, in an amount affected by Fortune, but can also be picked up with Silk Touch.
• Emits a light level of 5.

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Block of amethyst

• A block found in amethyst geodes.
• Unlike the budding amethyst, the block of amethyst can be obtained when mined.
• Can also be crafted with 4 amethyst shards.

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Budding amethyst

• Generates amethyst crystals on any of its sides (if next to a water source block or air, and if the side is not against another block), in a given time.
• Cannot be obtained when mined, even with Silk Touch, and does not drop anything.
• Breaks immediately if pushed by a piston or sticky piston.
  • Cannot be pulled by sticky pistons.
• Generates in amethyst geodes.

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Calcite

• An off-white stone that generates in geodes, between tuff and amethyst.

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Candles

• Crafted with honeycomb and string.
• Come with 16 dyed types and a yellowish non-dyed type.
• Can be lit by any item that produces fire.
• Up to 4 can be placed in a single block, similar to sea pickles, for a maximum light level of 12.
  • Only candles of the same color can be placed on the same block.
• Only one can be placed on an uneaten cake and lit.
  • If any of the cake is consumed the candle pops off.
• Can be placed, but cannot be lit, underwater.

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Copper block

• Can be crafted with 9 copper ingots, and can also be crafted back into 9 copper ingots.
• Oxidizes and changes texture to a turquoise-green over time.
• Can be stopped from oxidizing by combining it with a honeycomb to create a waxed copper block.
• Can be crafted into cut copper.

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Copper ore

• Generates randomly underground in small blobs, but this has been confirmed to be a placeholder.
• Has the same rarity as iron.
• Generating starts at the same minimum level(s) as iron.
• Can be smelted into a copper ingot.

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Cut copper

• Can be made into stair and slab variants.
• Oxidizes and changes texture over time.
• Can be stopped from oxidizing by combining it with a honeycomb to create waxed cut copper.

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Cut copper slab

• Oxidizes and changes texture over time.
• Can be stopped from oxidizing by combining it with a honeycomb to create a waxed cut copper slab.

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Cut copper stairs

• Oxidizes and changes texture over time.
• Can be stopped from oxidizing by combining it with a honeycomb to create waxed cut copper stairs.

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Lightning rod

• Can be crafted with 3 copper ingots.
• Nearby lightning strikes within a 64 block radius get redirected to the lightning rod.
• Gives off a redstone signal with a strength of 15 if hit by lightning.
• Can be activated directly by throwing a trident with Channeling at it during a thunderstorm, though this does not produce a redstone signal.

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Tinted glass

• A black variant of glass that does not let light pass through.
• Can be crafted with 4 amethyst shards and a glass block.
  • Stained glass cannot be used to craft tinted glass.
• Drops itself if mined without Silk Touch or even by hand, unlike glass.

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Tuff

• A grayish stone that composes the outer layer of amethyst geodes.

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Amethyst shard

• Obtained from breaking amethyst clusters.
• The amount dropped can be increased with the Fortune enchantment.
• Can be used to craft tinted glass, blocks of amethyst and a spyglass.

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Bundle

• Crafted with 2 string and 6 rabbit hide.
• Used to store other items (except shulker boxes) inside of it.
• Is able to hold different types of items inside of it.
  • Holds the equivalent of one single stack of items.
    • Items with smaller stacks, such as ender pearls, take up more room in a bundle, and non-stackable items take up the whole bundle.
• The bundle's contents can be opened by pressing use while holding it.

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Copper ingot

• Obtained by smelting copper ore.
• Used to craft copper blocks, lightning rods and spyglasses.

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Spyglass

• Crafted with 2 copper ingots and an amethyst shard.
• When used, it zooms in on wherever the player is looking, but limits their view to a small circle. 👁 Image
  
  • The overlay that limits the view can be removed with a resource pack or by pressing .
• There is a unique animation for using the spyglass, which is visible in third person perspective.

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Amethyst geodes

• A new feature found uncommonly underground (can rarely appear exposed to the surface close to sea level).
• Contains blocks of amethyst and budding amethyst blocks, which are encased in a shell of calcite and tuff.
  • Also generates with a small air pocket nearby which may open into the geode.
• Generally generates at or below sea level. (Y=63)
• Most commonly generates at lower levels. (Y=0 to Y=40)
• Overrides standard caves and canyons, but is overridden by mineshafts.
• Currently has a high generation rate, presumably for testing purposes which was also done with ruined portals before.

Loot tables

• New functions: set_banner_pattern
  • Sets tags needed for banner patterns. Parameters:
    • patterns – list of pattern objects:
      • pattern – name of pattern (square_bottom_left, bricks, etc.)
      • color – name of color (light_gray, etc.)
    • append – if true, new elements are appended to existing ones instead of replacing.

Tags

• Added the candle_cakes block tag.
  • Contains all 17 types of candle cake.
  • If the player puts a candle on a cake, and keeps clicking the candle on the cake, the candle is duplicated.
  • Blocks in this tag are considered candle cakes and can be lit, if they have the lit block states set to false.
• Added the candles block and item tags.
  • Contains all 17 types of candles.
  • Blocks in this tag are considered candles and can be lit, if they have the lit and waterlogged block states and both are false.
  • Cakes use this tag to determine if a candle item can be placed on it or not.
• Added the cauldrons block tag.
  • Contains cauldrons, water cauldrons, and lava cauldrons.
  • This tag is used in certain pathfinding processes.
• Added the crystal_sound_blocks block tag.
  • Contains amethyst blocks and budding amethyst.
  • Blocks in this tag play the "amethyst block chime" sound repeatedly for a short amount of time after being stepped on, gradually decreasing in volume.
• Added the ignored_by_piglin_babies item tag.
  • Contains leather.
  • Baby piglins do not attempt to pick up items in this tag. Adult piglins are unaffected. Baby piglins still follow the other rules adult piglins follow.
    • If an item is in this tag while simultaneously being recognized as a wanted item by piglins, this tag takes precedence.
• Added the piglin_food item tag.
  • Contains raw and cooked porkchop.
  • Piglins can eat items in this tag.
    • Eating refers to the piglin seeking out and picking up an item without appearing in its inventory, thus vanishing.

Cauldrons

• Can now be filled with lava.
  • Lava filled cauldrons can damage players and mobs inside of it.
  • Lava filled cauldrons give off a redstone comparator signal of strength 1.
• Have been split into normal, water and lava cauldrons.

Grass path

• Renamed to "Dirt Path", as per Bedrock Edition.
  • The block ID has also been changed to dirt_path.
• Can now be made with dirt, coarse dirt, mycelium, and podzol.

Pistons

• Particles now appear if a block is broken by a piston.
  • Sounds, however, do not.^[2]

All rails

• Are now able to be waterlogged.
• No longer break when contacted by water.

Water

• Flowing water no longer breaks rails.

Shulker boxes

• Now mimics the opening and closing of a shulker.
  • Unlike its mob counterpart, it does not elevate the player when they are standing on it.

Cakes

• Have a variation called "Candle Cake".
  • Can be created by using a candle on an uneaten cake.
  • The candle on the cake comes with 17 colors, depending on the color of the candle used to create it.
  • Pop out the original candle when any of the cake is eaten.

Firework rockets

• Simple firework rockets with one gunpowder can now be crafted using the recipe book.

Shulkers

• If a shulker is hit by another shulker's projectile, it now has a chance of spawning a new shulker.
  • Shulkers are more likely to spawn new shulkers when there are fewer other shulkers nearby.

Experience orbs

• Now sometimes merge when in large quantities, to improve performance.
  • Merging does not affect the amount of experience gathered from collecting the merged orbs.
• No longer follow dead players.

Minecarts

• Can now move in water, but move considerably slower than they do on land.

Data and resource packs

• Changed the resource pack version number from 6 to 7, as the following have been changed:
  • Drowned texture mirroring has changed.^[3]
  • Slots for the game mode selector are now 26 pixels instead of 25.
• Split the pack_version number into separate resource and data pack versions; the data pack version remains at 6.

Dedicated servers

• A dedicated server can enforce custom resource packs by setting require-resource-pack in server.properties. When this option is used, players are prompted for a response and are disconnected if they decline the required pack.

Entity storage

• Entities have been extracted from main (terrain) chunks and are now stored in separate entities directory (similar to POI storage). Those new files are still region files with NBT.

Libraries

• The game now uses javabridge 1.1.23 instead of 1.0.22.

54 issues fixed

From released versions before 1.17

• MC-98219 – Experience orbs follow dead players.
• MC-108469 – Chunk-wise entity lists often don't get updated correctly (entities disappear).
• MC-112147 – Lava burning items or XP orbs sound muted when "Friendly Creatures" slider is turned off.
• MC-126997 – Undyed shulker box still uses cauldron's water when right clicking.
• MC-127201 – /replaceitem makes quite an obnoxious sound, which is not heard by the person whose items are being replaced.
• MC-127692 – Experience build up in furnace when using a hopper which can cause severe lag.
• MC-130449 – Cartographer villager freezes or crashes the game when unlocking explorer maps.
• MC-130584 – When a structure loads, water sources in the structure spread into waterloggable blocks.
• MC-133691 – Blocks cannot be placed normally on a full cauldron.
• MC-135552 – Dead entities are saved to chunk.
• MC-136497 – XP orbs causing severe lag.
• MC-141034 – taiga_fisher_cottage_1 is filled with water.
• MC-143732 – Undead mobs that are halfway in sand blocks dont burn in daylight.
• MC-151270 – Teleporting an entity from another dimension can cause UUID duplication in entity sections.
• MC-160994 – Blocks broken by pistons do not display breaking particles.
• MC-161592 – Entities lose their scores when switching dimensions.
• MC-168398 – Guardian beam is darker.
• MC-169900 – Incorrect jigsaw setting in snowy_small_house_8.
• MC-169945 – Skeletons do not burn in minecarts while being exposed to daylight.
• MC-170653 – Fireworks fired from a dispenser get stuck in the air when removing the block they crashed into.
• MC-171852 – Putting item in a spectator's hand plays sound "Gear equips" for other players.
• MC-174685 – Drowned arm texture is reversed by the model.
• MC-175959 – One door is open in taiga_shepherds_house_1.
• MC-177539 – When flattening a grass block into a path immediately after the grass block grows from dirt, the shovel sound doesn't play.
• MC-177622 – One log in taiga_butcher_shop_1 seems to be misrotated - causing the side roof to look asymmetrical.
• MC-177624 – Entrance in snowy_medium_house_2 is asymmetrical.
• MC-181889 – Equipping sound plays when mobs picking up non-armor items.
• MC-185357 – Removing a plant from a flower pot still plays generic armor equipping sound/shows Gear equips in subtitles.
• MC-185359 – Using a bucket in Survival mode still plays generic armor equipping sound/shows Gear equips in subtitles.
• MC-185360 – Milking a mooshroom for stew still plays armor equip sound/shows Gear equips subtitle.
• MC-188044 – Using a banner on a filled cauldron plays hand animation.
• MC-189565 – Some entities do not render inside of spawners and producing error log spam in console, potentially causing lag.
• MC-190896 – Lag when opening a shipwreck chest containing buried treasure map.
• MC-192594 – plains_stable_1 misplaced blocks.
• MC-192629 – plains_stable_2 misplaced blocks.
• MC-192876 – Misplaced trapdoor on taiga_decoration_6.
• MC-192879 – Wall incorrectly placed on certain taiga houses.
• MC-192930 – Zombies picking up items play the gear equipping sound and subtitle.
• MC-193071 – Eating food items that return empty containers still play gear equipping sound.
• MC-194685 – Collecting water from cauldrons with glass bottles in Creative mode is still inconsistent.
• MC-194686 – Collecting water from cauldrons with buckets in Creative mode is still inconsistent.
• MC-195125 – plains_animal_pen_1 misplaced block.
• MC-195126 – plains_animal_pen_3 misplaced blocks.
• MC-195351 – Comparator in compare mode can schedule unneeded tileticks.
• MC-196542 – Small cleanup for skylight propagation code.
• MC-196638 – Placing an armor stand logs warning "Trying to add entity with duplicated UUID".
• MC-197009 – Referencing empty item tag in recipe can crash client.
• MC-197140 – Jack o'lantern does not come after carved pumpkin in Creative inventory.
• MC-197179 – Baby piglins that pick up leather do not despawn, cluttering the Nether with unnecessary baby piglins.
• MC-197524 – Border chunks do not enforce neighbors to be loaded, causing light updates to get stuck.
• MC-198129 – ReplaceBlobsFeature changed from 1.16.1 to 1.16.2, affecting Basalt Delta generation.
• MC-198414 – If the angle in /spawnpoint is set to ±infinity, and the player dies, it will kick the player, and upon rejoin will crash the game.
• MC-198807 – Making piglins and piglin brutes angry at certain entities (like dropped items) crashes the game.
• MC-202246 – Drowned navigation causes memory leak/performance degredation.