Footprints on the Ground

Hi crinrict 

Yes, those are real footprints, as if someone had walked through them. I even saw animal paws, like a dog, next to the footprint. As if someone had taken the dog for walk. I have the Pack Cats & Dogs. 
Yes I have the Pack Seasons.
I haven‘t found these footprints everywhere, but only in certain places: In Windenburg near the Library, at the Nightclub „Narwlas“, and at the cafe next door. There are no residental lots nearby. I have the pack Get Toghether.
On the World Map in Newcrest, the large plot of Land in the bottom right, and „only“ there. I don‘t see these footprints on any other plot of Land in Newcrest.
And now I also have these footprints in Nordhaven; See pictures.

All other Worlds are not affected.
Oasis Spings, Willow Creek, Horse Ranch, Growing Together, High School Years, Cottage Living, Snowy Escape, Eco Lifestyle, Island Living, Cats & Dogs, City Living.

 
After fifteen hours of Sim time in live mode, I went back to Nordhaven via Manage Worlds and checked the lots in Build Mode. The footprints were gone.
Please belive me, I know these footprints will reappear. I speak from experience, from my last two years, when I spent a lot of time in Build Mode. I saw these footprints repeatedly in the same place, just because I was playing with my Sims from time to time.
This for Information.