Yes, I did send them a 2nd reply with this info.Curious. Did you respond about this in your ticket?
In the meantime also some more testing: the street and area where Misty her shop is, was also a real hotspot for duplicates.
And here the same: with setting to On a LOT of duplicates, with setting to Off just the normal, occasional duplicate.
But what is even more important for me, is that the "world feel" is back. Normal crowd variation, normal traffic variation. That setting here has a real impact on the world.
As of why? I don't know. Could be a general bug, could be cause of my specific PC build. But I think it's a general issue since it's something that people do have or not. Maybe it's acting this way because I have no HDD in my PC and setting it to On just conflicts too much?