deep dark biome doesn't locate correctly with /locatebiome

hi again
in this seed and coords(on the photo) if you locate a deep dark biome, you get this coords and the minecraft biome is deep dark! but there isn't any type of sculk blocks or anything from the deep dark biome, and also this xyz is under the lava! and this deep dark biome is very very small, maybe a minibiome issuse?!...