Interesting question here, and one I’ve thought about a lot as all my runs in Calgary, Alberta seem to count twice. Only just realized that this parent-child issue exists here too; with the “Census Division No. 6, Alberta”, which includes a big chunk of the province and is considered a ‘city’.
Any solution I can consider (exhaustively checking parent-child issues, adding the city name each completed street is associated with, cross-referencing completed streets to a users total count to eliminate duplicates) seems super computationally challenging, with the only impact being on the “Completed Streets This Week” leaderboard.
I’d vote to leave things as they are!