I was just looking at the Groningen thing again, and I noticed a similar duplication for Midden-Groningen, with one in the Netherlands and one in Germany. I don’t think that the German one exists in real life, and “view on map” shows a point in the Gulf of Guinea, so maybe another one for the deletion queue.
Found a few more:
Aachen 69348 and 133842 (dupe)
Euskirchen 70096 and 134180 (dupe)
When the more important work of getting everybody’s runs back up is done it might be worth looking at the Germany data import more generally. Many large cities are missing entirely (München, Bremen, Stuttgart), while some two-street villages in the middle of nowhere (with 0 striders) are included, like Jenalöbnitz, Thüringen. I don’t know if there are enough striders in Germany to make it worthwhile spending time on this, but there does seem to be a systematic problem somewhere.