I listed Sporothrix set for sale on WFM and the blueprint is actually on sale there, I dunno what I'm missing but it's not tradeable for me.   This is a screenshot when setting up shop in maroo, I initially tried trading in dojo but went to maroo just in case:   And this is my inventory, you can also see it doesn't have the trade icon on it:   EDIT: Apparently Arum Spinosa blueprint has the same issue, I don't own one but I've seen it mentioned.