I have recently had issues with on my PC causing the game folder under My Documents to be cleared. So, If the folder is cleared the game tries to start as a fresh start and it loads into a tutorial game as the English, which I usually skip. And I think that in that specific game the map is releved initially for a few seconds, which sounds alright. But the issue happens when you quit the match at the start and try to do a skirmish or even a ranked game and the map is also revealed in both skirmish and ranked games (I accidentally found this without any intentions to cheat) too for the first game and not in subsequent games. So, I guess it would be good to add a check to ensure that the initial map reveal is restricted to the tutoirial game and does not happen in further games.
I have added a video indicating the issue. Please do fix the bug as I think that it could lead to cheating in online matches.