Completed mission objective not registering

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Hello everyone, I just "finished" the mission "Lieutenant Federov's Response" (I think that is the mission title) in the "Manstein's Big Guns" campaign and have completed all objectives except the game doesn't seem to register me completing the "Destroy the Italian and Romanian armoured convoy" objective, despite there being nothing left to destroy. I even made sure that every vehicle in the convoy was outright destroyed and not left as "existing" on the mini-map.

I don't know if this is just poor coding on the game's part or if it is a common problem for this mission or what. I tried restarting the game but unfortunately after several attempts all of my autosaves and regular saves are after completion of the convoy objective. I guess my only option is to do the mission all over again, hoping this time it clicks.

Edit: Oops, didn't see this issue was already answered in another post, didn't want to spoil anything so I didn't check any others.