Well I had exactly the same problem and had actually restarted the mission but it I still got the same bug. I finally managed to get it done. When the convoy started moving I waited for it in the base. The allies were getting slaughtered but I didn't moved a finger ,untill I got the message "Help us comrade, they have us pinned down", or something like that. I moved in and voila! Finally I got the objective completed!.
P.S. Have in mind that I had the boats secured and the base cleared out by that time ,I don't know if it had any to do ,just mentioning it in case it won't work either way.
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