Minecraft Snapshot 20w28a

This week's snapshot introduces experimental support for custom biomes in data packs. This work has involved redoing some of the internal plumbing of things behind the scene, so it might be a bit leaky. We hope no important parts drip out, but if they do, pick them back up for us, please.

As always, make sure to make backups if you try a world in a snapshot.

Changes in 20w28a

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• Villagers now emit green particles when joining a village, setting a home bed, or acquiring a job site/profession
• Brewing stands can now be crafted with blackstone
• Tweaked bartering loot
• Totems of undying now give the fire resistance status affect for 40 seconds when activated

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Technical Changes in 20w28a

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• Custom worlds now support custom biomes
• Dedicated servers can now rate limit clients

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Customized world generation

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• There is now experimental support for a worldgen folder in data packs
• worldgen/biome can contain biome definitions
• worldgen/configured_carver can contain definitions for world carver settings
• worldgen/configured_feature can contain definitions for feature placements
• worldgen/configured_structure_feature can contain definitions for structure placements
• worldgen/configured_surface_builder can contain definitions for surfaces
• worldgen/processor_list can contain sets of block processors
• worldgen/template_pool can contain pool definitions for jigsaw structures
• Custom biomes can now be used in the single biome/caves/floating islands world types (add the data pack containing the biome first)
• Custom biomes can now be used in custom dimension generators

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Dedicated server packet limit

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• Dedicated servers can now kick clients that consistently send too many packets within a second
• Controlled with the rate-limit settings in server.properties
• The default rate limit of 0 means "no limit"

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Fixed bugs in 20w28a

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• MC-34661 Thorns enchantment causes double armor decay
• MC-65953 Tags IsBaby and IsVillager can't be changed from true to false with /entitydata
• MC-171363 Nether forest biomes: Large fungi and small plants only generate on the topmost layer of nylium, leaving all lower layers devoid of flora
• MC-172221 Hoglins, zoglins, ravagers, iron golems, and polar bears won't walk down a block if they are partially walking on air
• MC-173526 All Minecarts can survive in lava
• MC-174479 Cannot place sea pickles on soul sand
• MC-174520 Soul particle texture is incorrect for the first frame
• MC-176753 Piglins stand around dropped golden items if their "CanPickUpLoot" tag is set to "0b"
• MC-179369 Wandering Traders are always invisible in the Nether and the End
• MC-181204 doDaylightCycle button slightly incorrectly labeled
• MC-181233 Mobs cannot spawn on wooden trapdoors, but can on iron and nether fungus trapdoors
• MC-182430 Piglins continuously try and fail to pick up gold ingots if they can't reach them
• MC-182868 Rail updates are 4-5x times laggier since 1.14 if the rail is on top of a non-full cube
• MC-185684 Enderman can teleport when hit in cases where they previously would not teleport
• MC-185925 Casting issue: Mineral vein generation uses 32-bit floats, leading to precision loss and potential crashes
• MC-187112 Extra space in "Keep Jigsaws" button in jigsaw block
• MC-187126 Jigsaw block UI is not closed when pressing "Generate"
• MC-187129 Jigsaw blocks do not generate the correct structure until "Done" is pressed and the UI is reopened
• MC-188459 Potted cactus still missing cullface argument for top
• MC-188534 Potted cactus missing bottom face
• MC-189769 Fungi grows through fire
• MC-190098 Structure size and offset still limited to 32 for dedicated servers
• MC-190852 Advancement announcement message has switched brackets for right-to-left languages
• MC-190856 '/list uuids' shows parentheses incorrectly for right-to-left languages
• MC-190860 '/' (slash) in chat and command block shows legacy formatting symbol for right-to-left languages
• MC-190891 Certain redstone circuits causing lag
• MC-190892 Brackets in potion effects are reversed in right-to-left languages
• MC-191501 Opening a world from earlier 1.14 releases in 1.16 causes villagers to vanish
• MC-191571 Switched square brackets for right-to-left languages
• MC-191579 Book signing GUI has broken formatting for right-to-left languages
• MC-191656 Right-to-left languages don't perform as expected in creative search menu
• MC-192306 Crimson and warped slabs use incorrect colors on maps
• MC-193073 Game crashes when Piglins or Piglin Brutes convert to Zombified Piglins
• MC-193089 Mobs do not get damaged anymore if they're in lava and water at the same time
• MC-193125 Cannot use "Inventory" key to write in recipe book, it closes GUI instead (Default: "E")