In my 2 playthroughs, the one outside Junktown (next to the 2 PSIbugs) and the one in the GMS compound (guarding the 3 Mindshroom), both of them left non-interactable corpses.
In my first playthrough, the rathound alpha in the vents of the new Burrower complex worked, but I forgot what I looted from it.
In the second playthrough, I played without hacking and lockpicking so couldn't get there, but the rathound at Silent Isle also left a non-interactable corpse.