So yeah, I have had these images sitting on my hard drive for a while. I ended up making these not long after posting the last set at this time last year, and was really glad I'd been able to actually import the file into Twinmotion. That lead to me trying (and succeeding) at importing Cape Nowhere into Twinmotion, which lead to me making (and about to complete) my latest city, Maltstead.
Anyway, I am pretty sure I was trying both real-time and path traced views here, which is why the images were doubled.