Java Edition 20w45a

Minecraft 20w45a
Edition	Java Edition
Type	Snapshot
Release date	November 4, 2020
Snapshot for	1.17
Downloads	Client (.json) Server
Obfuscation maps	Client Server
Protocol version	0x40000005
Data version	2681

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

Additions

Blocks

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.

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.

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.

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.

Calcite

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

Candle

• Crafted with honeycomb and string.
• Comes 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.

Copper Block

• Can be crafted with 9 copper ingots, and can also be crafted back into 9 copper ingots.
• Oxidises and changes texture to a turquoise-green over time.
• Can be stopped from oxidising by combining it with a honeycomb to create a Waxed Copper Block.
• Can be crafted into cut copper.

Copper Ore

• Generates randomly underground in small veins, 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.

Cut Copper

• Can be made into stair and slab variants.
• Oxidises and changes texture over time.
• Can be stopped from oxidising by combining it with a honeycomb to create Waxed Cut Copper.

Cut Copper Slab

• Oxidises and changes texture over time.
• Can be stopped from oxidising by combining it with a honeycomb to create a Waxed Cut Copper Slab.

Cut Copper Stairs

• Oxidises and changes texture over time.
• Can be stopped from oxidising by combining it with a honeycomb to create Waxed Cut Copper Stairs.

Lightning Rod

• Can be crafted with 3 copper ingots.
• Nearby lightning strikes within a 16 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.

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.

Tuff

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

Items

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.

Bundle

• Can be crafted with 2 string and 6 rabbit hide.
• Used to store other items inside of it.
• Can only hold a single stack of items, but is able to hold different types of items inside of it.
  • Items with smaller stacks, such as ender pearls, take up more room in a bundle.
    • One non-stackable item takes up the whole space.
• The bundle's contents can be opened by pressing right-click while holding it.
• Cannot hold shulker boxes.
• Even though bundles are not stackable, bundles can be nested.
  • Can hold up to 16 bundles.
  • Only empty bundles can be placed in other bundles without using commands.
• Note: Bundles can hold any amount of any item if added using commands.

Copper Ingot

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

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.
  • The overlay that limits the view can be removed with a resource pack or by pressing F1.
• There is a unique animation for using the spyglass, which is visible in third person perspective.

World generation

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 ravines, but is overridden by abandoned mineshafts.

General

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 will be 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 will be 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 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.

Changes

Blocks

Cauldrons

• Can now be filled with lava.
  • 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 updated to dirt_path.
• Can now be made on top of dirt, coarse dirt, mycelium, and podzol.

Pistons

• Particles now appear if a block is broken by a piston.
• Breaks Budding Amethyst if pushed or pulled with a piston or sticky piston.

All rails

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

Water

• Flowing water no longer breaks rails.

Items

Firework Rockets

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

Mobs

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.

Non-mob entities

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.

General

Data and Resource Packs

• Changed the pack_version number in pack.mcmeta from 6 to 7.
• 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 will be prompted for a response and will be 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.

Fixes

44 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-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-169900 – Incorrect jigsaw setting in snowy_small_house_8.
• MC-169945 – Skeletons do not burn in minecarts while being exposed to daylight.
• 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-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-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-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.

Video

Video made by slicedlime: