In addition to the missing cave tags and overworld tags, there are more missing tags or at least, tags I feel should be populated with Alex's Caves stuff.

• Ancient Sapling, Thornwood Sapling, and Pewen Sapling to minecraft:saplings tag.

• Bone Worms, Underweed, Tree Star, Fiddlehead, Curly Fern, and Pewen Pines to minecraft:replaceable tag so other mods know they can replace these blocks safely like they do for grass.

• Underweed, Tree Star, Fiddlehead, Curly Fern, and Pewen Pines to minecraft:replaceable_by_trees tag so trees can grow and not be blocked by these blocks.

• Primordial Caves to forge:is_lush.

• Forlorn Hollows to [forge:is_spooky](https://github.com/TelepathicGrunt/TACT).

• Magnetic Caves to forge:is_sparse/overworld to signal no vegetation spawns here.

• Toxic Caves to forge:is_wasteland.

not sure on the use case for forge:is_lush. is this only for biomes similar enough to the lush caves? since I don't think the primordial caves would fall under that.

My understanding is forge:is_lush is for high dense underground vegetation caves that are conductive to life. It would explain why lush caves are in it but not jungle.

Since Primordial Caves are dense in plant life and has water, etc, I felt it made sense to add Primordial Caves to the tag. It would be ideal if mods that are adding mobs like Glare to lush caves are using the is_lush tag. So that Glare can spawn in Primordial Caves and become dino food lol