Er...you sure this is a bug and not a feature?
Just kidding...hope you're able to figure something out. I wonder if some of the more natural fragrances (stuff that uses essential oils instead of chemicals) would work OK. Might be worth trying something from a Whole Foods or such like. I had a friend who was allergic to any anything petrolatum derived (most lotions contain some such stuff), and natural foods stores were about the only places that had stuff that worked.
In other news....a new work betta - I has one.
The mega-HyVee near where I work had a whole section of “natural foods” stuff and a bunch of “natural beauty” including some vey expensive shampoo that has no fragrances added. So, ready to give it a try.