21w42a — release journal

What 21w42a changed for data packs, measured against 21w41a, the build before it. Released 2021-10-20; development build — not a release.

⚠ Entries removed

5 registry entries were removed. A pack that names one of them will fail to parse where it does.

Formats

	21w41a	21w42a
Data pack format	8.0	8.0
Resource pack format	8.0	8.0
Data version	2839	2840

Registries

85 entries added and 5 removed across 10 registries.

Registry	Change	Added	Removed
`worldgen/noise`	new registry	`aquifer_barrier`, `aquifer_fluid_level_floodedness`, `aquifer_fluid_level_spread`, `aquifer_lava`, `calcite`, `cave_cheese`, `cave_entrance`, `cave_layer`, `clay_bands_offset`, `continentalness`, `erosion`, `gravel`, `gravel_layer`, `ice`, `iceberg_and_badlands_pillar`, `iceberg_and_badlands_pillar_roof`, `jagged`, `nether_state_selector`, `nether_wart`, `netherrack`, `noodle`, `noodle_ridge_a`, `noodle_ridge_b`, `noodle_thickness`, `offset`, `ore_gap`, `ore_vein_a`, `ore_vein_b`, `ore_veininess`, `packed_ice`, `patch`, `pillar`, `pillar_rareness`, `pillar_thickness`, `powder_snow_surface`, `powder_snow_under`, `ridge`, `soul_sand_layer`, `spaghetti_2d`, `spaghetti_2d_elevation`, `spaghetti_2d_modulator`, `spaghetti_2d_thickness`, `spaghetti_3d_1`, `spaghetti_3d_2`, `spaghetti_3d_rarity`, `spaghetti_3d_thickness`, `spaghetti_roughness`, `spaghetti_roughness_modulator`, `surface`, `surface_swamp`, `temperature`, `vegetation`	—
`int_provider_type`	changed	`clamped_normal`	—
`item`	changed	`music_disc_otherside`	—
`model`	changed	`block/light_00`, `block/light_01`, `block/light_02`, `block/light_03`, `block/light_04`, `block/light_05`, `block/light_06`, `block/light_07`, `block/light_08`, `block/light_09`, `block/light_10`, `block/light_11`, `block/light_12`, `block/light_13`, `block/light_14`, `block/light_15`, `item/music_disc_otherside`	`block/light`
`particle_type`	changed	`block_marker`	`barrier`, `light`
`sound_event`	changed	`music.overworld.dripstone_caves`, `music.overworld.frozen_peaks`, `music.overworld.grove`, `music.overworld.jagged_peaks`, `music.overworld.lush_caves`, `music.overworld.meadow`, `music.overworld.snowy_slopes`, `music.overworld.stony_peaks`, `music_disc.otherside`	—
`texture`	changed	`item/music_disc_otherside`	—
`worldgen/configured_feature`	changed	`pointed_dripstone`	`small_dripstone`
`worldgen/decorator`	changed	`scatter`	—
`worldgen/feature`	changed	`pointed_dripstone`	`small_dripstone`

The official notes

Read the 21w42a article on minecraft.net.

That article's technical changes are grouped under these headings — open it for the detail:

Particles
block_marker

Minecraft Wiki page for 21w42a.

In the journal

← 21w41a · All builds · 21w43a →

Sources

misode/mcmeta — 21w42a summary — formats and registries, generated from the game’s own data.
minecraft.net — 21w42a — section names only.