something changed sometime because I just deleted Vallentuna kommun from your list, reprocessed that activity, and the city has not been re-added to your list. 
I did find some code that will add a city to our list for just having progressed streets, but I changed things on Sept 8 2020 to not use that any more (uncertain when that was released).
For @r.weide … you’ve got an activity that runs along the border of the city quite a ways - I’m wondering if the cleanup I did to remove streets extending past the borders caused your situation.
I think I should figure out a way to clean out everyone’s “0 of X streets” cities, then we can wait to see if any return.