for what it's worth ---
i opened the part file and split it into multiple bodies --- i cut a small gap around the leads separating them from the plastic body, creating 7 bodies. i then applied the appearances to each body as opposed to faces. the part-in-subassembly not appears "correct" per the part file.
i'm still not sure on the "why" or "how" though, this is just a work around, and i'd rather not have a 7-body part occupying memory when it could be a single-body part.