Turn 1. Dec. 7, 1941 For me this happens 100% of the time(edit last night-I just tried it again now). Most of the times both CVs get sunk. In this case, the Allies got lucky. The Allies movement triggers a Carrier Interdiction. The Allied CVs tried to attack is my assumption.
Here is the vid:
https://www.youtube.com/watch?v=PIr080n ... dgamer0100
Event script date is 1/1/1939. When I change it to 12/21/1941 this is no longer an issue. The IJN task force has left the area and the AI doesn't pursue it.
Edit: I noticed if it tries to attack the sub, usually no damage. If it goes after the CVs both get sunk. The only time the Allied CVs don't come out is when it heavy rain. Could it be the location of the sub since it's in shallow water? Maybe it's a unique problem I have.
I've just tried it 5 times in a row and three times it went after the sub and heavy rain the other two times stopped any CV action. I will continue to test to see if I can capture it on video for you.