I've been off reddit but a couple of days ago I was farming D-Railed and noticed that the loot was "underground". Then recently I went to brooklyn bridge and nothing weird happened so I thought it was solved, but looking at this thread went to D-railed again, and this is what I got:
https://ibb.co/sV4HJXd
I don't know if it's useful and somehow you can "explore" that little "piece of land" but it might be helpful. I remember because I was stationed up there killing enemies, so I drove them to that place again in normal. Unfortunately I couldn't get a piece of loot there, but the other day I could and it was the same, slightly underground.