The map has questionable "quirks", there's also "non-Terrain" more in the middle that one can usually not access and that hides even the silhouettes of units.
We played Ardennes Forest with grouped lines and 8 players. My CC got generated on a hill, unreachable from the downside. I could ungarrision downhill and rebuild. Was a fun challenge, check the replay, but it should be fixed.
commands.txt
Agree with manowar. But quitting the game is also a option. It's just a waste of time that can be spend else where when one is frustrated. Muting with autociv helps a bit. In lichess you can disable the chat completely and just get paired up in a game with some random persons. 0 a.d. is not so important.