I made an off-peak journey using my Railcard Oyster from Kilburn High Road to Hackney Central on a direct train. It charged me £1.70 at touching out. The fare finder showed that it is a zone 1-2 fare which is clearly wrong as the Overground train only runs within zone 2.
I’ll wait for a few days and see if there is a refund. If not I’ll contact TfL saying that the fare is wrong.