Version: 1.17-6
Log: https://pastebin.com/8WGDxXWG (had to cut it down due to opengl error in log making it huge.)

The Druid Band only counts grass and rooted dirt as "natural soil."

I've listed some blocks which the player would assume would also count but don't for whatever reason:
Dirt
Podzol
Coarse Dirt
Dirt Path
Sand
Red Sand
Crimson Nylium
Warped Nylium

Not sure if this is an oversight or intentional as that means players can't use the band whatsoever inside of giant taiga, deserts, or even the nether.