Hi there,
in alchemy you can use the shrooms either as a herb/ingredient or as a shroom in the mushroom decoction. For the cave grown shrooms like button, cremini and portobello mushroom they are accepted as a mushroom for the elixir, but in every other recepie (like herbal grind, lye absolution or similar) it does not accept it as ingredient. There are values behind those mushrooms, you can make working - even perfect - mushroom decoctions with it, but not use it in other alchemy recepies. This should be fixed.