We’re aware of this issue and we have fixed parts of it for the upcoming 2.4.6 patch. However, we’d be interested in knowing what settings you had selected in your single player game (difficulty settings, or any settings you may have customized from the default ones).
I forget the first time. I have restarted three games where a restored to default settings for civilized, decadent and barbaric. Each time mostly empty npc camps.