I'm sorry, I thought I had added tags when I posted. I did remove all mods and CC. There are no NAPs active, and I play with them disabled via game settings. The lot in question is Vista Quarry in Oasis Springs. HOWEVER, it was a copy of that lot, placed on an adjacent empty lot in the same neighborhood. It was copied and placed with no alterations while unoccupied, but the other (original) version of the lot does not have the same issue, although at least twho other lots in the neighborhood do. I begin to suspect that this instance may be caused by some instability caused by copying that lot since the behavior did not appear until after playing this lot. Perhaps a corruption. I'm going to move on to a different neighborhood with future families and continue to monitor their behavior. If any new pattern or issue arise, I'll update. Otherwise, this may be a non issue in spite of the hours spent trying to make sure I didn't just make a random report.