The Map does work but it's not named "Dear Agony" instead it is named "Dear agony.." (yes, with two dots). However, I don't get the "victory" screen after killing and claiming everything on the map and it crashes more frequently than the other maps for some reason (played on 1.3)
So, as a heads up for everyone: in order to start Mission 19 you have to either rename the map to "Dear Agony" or put "Dear agony.." in your command.