Horizontal lines often occur when the area to print suddenly changes per layer, especially on small models. You also see that in most boat-benchies. I often see that in my small models. But I don't know if that is the cause here. Another reason could be if the slicer changes direction from clockwise to counter-clockwise (if they do this, I don't know). Maybe you can see what exactly happens when watching closely?
Also having this problem on my dog.
It's not as clear but it's there. Any progress? I would predict that it might be something about too .much retraction as this dog was printed with 10 mm retractions. My other dogs don't have this pattern and they were printed at 6 and 8 mm retractions with lots of stringing.
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