Java Edition 20w28a

20w28a is the second snapshot for Java Edition 1.16.2, released on July 8, 2020.

Blocks

 * Brewing stands
 * Can now be crafted with blackstone.

Items

 * Totem of Undying
 * Now gives the Fire Resistance status effect for 40 seconds when activated.

Mobs

 * Villager
 * Villagers now emit green particles when joining a village, setting a home bed, or acquiring a job site/profession

Gameplay

 * Bartering
 * Tweaked 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  folder in data packs
 * can contain biome definitions
 * can contain definitions for world carver settings
 * can contain definitions for feature placements
 * can contain definitions for structure placements
 * can contain definitions for surfaces
 * can contain sets of block processors
 * 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  settings in
 * 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")