Poisonous Concoction can't be qualitied.

It is literally impossible to quality PCONC. I assume it's the same case for the other Concoction skills. I right click a GCP while in skill tab, other nearby gems highlight indicating they can be GCP'd but PCONC doesn't highlight. I tired using a gcp while passive tree was open on the ascendency node and that didn't work either.

https://imgur.com/a/jbP1QnU