So, if I may ask, what were the specific sets of flights where EF showed D available yet an agent saw D0 when trying to book into an RTW?

Because EF pulls from the presumably same GDS data as an agent booking an RTW, I'm trying to understand where people have experienced the discrepancy. We've all seen many cases of married segment logic where D is not available on a set of flights booked as a connection, or where D is available from one point of sale but not for another, but reportedly neither is the case here.