When using the Vampirism mod, Adzuki plants will generate in the Vampire Forests:

If this is an issue on Vampirism's end, please let me know and I will move the issue to their tracker. Thank you.

So far as I can tell, the Vampirism mod's biome has the "spooky" biome tag, it may be desirable to prevent forest biomes with that tag from generating adzuki bushes.