BAF Mission 2; Jackal's disappearing?

Playing Mission 2 in the British Campaign. Seems like every time i dismount my section and we move out of sight of the vehicles one or both are gone when we come back to mount again.

Is this a feature? Bug? Anything I can do to keep them from disappearing?

Thanks.

I restarted the campaign and ran the mission (running beta on my machine). It didn't happen, so I don't know what to tell you.

What I did observe was when we moved away, over time the map marker of the vehicles disappeared. I guess knowledge timed out, or they became 'unassigned', or whatever. But when we completed and came back they were still in place.