Campaign mission bug – unable to interact with items and mark targets

In the first mission of the campaign, after reaching the snipers, I can’t pick up the ammo, and the collectible dog tag isn’t there’s no interaction with them at all. What’s worse, I can’t mark vehicles with the laser designator because the game doesn’t trigger the script to give it to me, even though I’m standing in the marker... which makes the campaign completely unplayable.