https://wccftech.com/hangar-13s-cancelled-project-rhapsody-berlin-map-found-in-mafia-iii/

Sometimes, for some reason, developers leave files of cancelled projects in other released games. That's apparently the case with Hangar 13 and Project Rhapsody, their cancelled new IP which was brought to light by Jason Schreier roughly two years ago.

Mafia II: Definitive Edition a Mess on Consoles, Videos Show Glitches and Awful Framerate