Yea. I had some Engineer II's in the system running Free roam and Engineer Is parked right next to the mines. They definatly weren't doing anything better at the time.
I just tested this out in my current version (1.011O), and it's working fine. After I release that, maybe you can check again and see if it works in your savegame. These are
enemy mines we're talking about, right? Your engineers clear enemy mine remains, not yours or allies (those are useful for rebuilding with a mine layer, after all). And these were mine
remains, and not actual mines, too, right? Not permamines or something? Sorry, but I gotta check stuff like that.