For example using Carpentry, the Wrapped Elm Longbow uses no elm at all. And the Plumed Yew Crook similarly uses no Yew. Yew Crooks exist and are made by carpenter, but for some reason the plumed yew crook uses a Walnut Cane instead. I can't tell if this is intentional or if they just messed a lot of recipes up but it's kind of silly and dumb.