lensfun has two search modes for finding lenses in the db, strict and loose. RT uses strict, which sometimes causes failures like this. I tried using loose, but it seems it’s actually too liberal, and sometimes it finds quite different lenses than what you want. I suppose we could come up with some heuristics, but for now I preferred to stay on the safe side. after all, a user could still pick up the lens by hand, and have a “custom auto matching” by using a dynamic profile rule (see the reference above by @ChasingShadows)