My organization is attempting to update to Ebay's new RESTful API from a Traditional API integration. We've noticed that, despite listings having an "InventoryTrackingMethod" of "SKU", those same listings (created by the Traditional API) do not seem to be interacted with by the RESTful API. As in, we aren't able to query those listings by SKU in any way. We've noticed that listings made anywhere other than the RESTful API don't get picked up with the getOffers endpoint. Using the traditional API's GetMyEbaySelling endpoint, we can retrieve all listings regardless of origin.
Are listings flagged with a tracking method of "SKU" (via the Traditional API) supposed to be queryable by the RESTful API (using the same SKU), or is this an incorrect assumption? Is there any overlap/interactivity between the two APIs or are they very separated?