Don't think its a bug, but a minor annoyance, at the last two objective; north and south road, the one pillbox bunker with the radio inbetween. You have to actually crouch to enter it, where with the others on the line you can be standing to go into them. Don't know if this is a bug or what, but if the axis team's tanks are going at a good speed, they can lineup with the trenchworks at the roads and drive over them without getting stuck unless the trench is wide enough.