I purchased Dishonored 1 through Steam when it came out.
I pre-ordered Dishonored 2 recently through Steam, and it warned me that I wouldn't get a second copy of the first game with my purchase. However, I see now that it gives you the Definitive Edition of the first game with your pre-order of the second game.
I never bought any of the DLC for the first game, so why did it not upgrade my game and give me the DLC?