I discovered an NPR in my current game and they seem to be in one of the habitable planets in the system. My sensors read 3.8k TH and 38k EM but other than that they have absolutely nothing, no ships, no ground forces and I believe no installations. My diplo ship is orbiting what I assume to be their homeworld, with her transponder on, but I don't get any notifications about communications. Has anyone experienced something like this before?