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

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

Technical Changes in 20w28a

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

Customized world generation

• 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

Dedicated server packet limit

• 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”

Fixed bugs in 20w28a

• 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”)

Get the snapshot

Snapshots are available for Minecraft: Java Edition. To install the snapshot, open up the Minecraft Launcher and enable snapshots in the "Installations" tab.

Snapshots can corrupt your world, so please backup and/or run them in a different folder from your main worlds.

Cross-platform server jar:

• Minecraft server jar

Report bugs here:

• Minecraft issue tracker!

Want to give feedback?

• Head over to our feedback website or come chat with us about it on the official Minecraft Discord.