Seeing the same, connecting flights DOM - INT when searching appear to be the biggest problem. Did find a routing with connections which displayed D1 available. Perhaps the site displays nothing if not D1 available for upgrade - as in the code is written to display all or nothing as domestic doesn't have any PS. Short answer - A bug I think.

Ultimately the process of searching for inventory has now become a bigger headache again as opposed to prior to 2/1. Additionally, if married segment logic is employed as it seems to be in some fashion, searching by segment is not a promise either. As usual, it appears what should have been easier is currently now harder.