It should work as usual in 1.21.1. I did some tests and some biomes lost certain features due to a tag change. I’ll do a review later until I can release a proper version.
Still, this version of the datapack is functional in 1.21.1
Added features in:
Atmospheric
- Aspen Parkland
- Rainforest
Biomes O' Plenty
- Maple Woods
- Old Growth Dead Forest
- Old Growth Woodland
- Snowy Maple Woods
- Woodland
- Lavender Field
- Orchard
Biomes We’ve Gone
- Aspen Boreal
- Black Forest
- Canadian Shield
- Coniferous Forest
- Howling Peaks
- Maple Taiga
- Overgrowth Woodlands
- Sierra Badlands
- Tropical Rainforest
- Weeping Witch Forest
Environmental
- Old Growth Pine Barrens
- Pine Barrens
- Pine Slopes
- Snowy Old Growth Pine Barrens
- Snowy Pine Barrens
Vanilla Backport
- Pale Garden
Regions Unexplored
- Autumnal Maple Forest
- Blackwood Taiga
- Deciduous Forest
- Eucalyptus Forest
- Fen
- Maple Forest
- Mountains
- Pine Slopes
- Pine Taiga
- Dry Bushland
- Temperate Grove
Terralith
- Birch Taiga
- Blooming Plateau
- Cloud Forest
- Forested Highlands
- Highlands
- Rocky Shrubland
- Shield
- Steppe
- Snowy Maple Forest
- Temperate Highlands
- Valley Clearing
- Windswept Spires