If you fire up the editor and open the "Happy Times" mission by clicking "File"... "open normal mission"... You'll find a tree - like explorer with "Inbound convoy" and "Escorts" on the right hand side.
First, you can compare if you have those ships installed.
Right - clicking the ships will show their properties, if one isn't installed correctly or altered or whatever, you'll know.
That can end in a lot of work.
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"I invite you to go inside this submergible hole in the water where you can nicely hide from destroyers."
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