Yesterday I bought incognito mode for a day, everything is fine. Today I bought it again, and submarine unit type is gone from the production menu. I try open guess acc from my android phone, and submarine is there. So, It's only gone for my incognito account.
here is the screenshot: https://prnt.sc/nSsbEl4PIL0y
I tried to make a new game, and even tried to reconnect, yet the submarine unit type is still disappear. checking at https://atwar-game.com/units.php also isn't there.