Yea unfortunately thats how it is
There was a save bug that has been fixed, so it should work now. Good thing you noticed and used the Save As, so you didnt lose any work...
Edit; If you want to test one of your new 0.8 maps vs the AI(s) I can create such a game for you running on the new gameengine. But then you need to be aware that there can be codechanges and unexpected downtime for this game as well
Let me know...