I’ve been working through the “Artworks with no city” list, trying to clean these up, and I’ve hit a few where the Artwork does have a City listed in some contexts, but not in others.
This also appears on the “Artworks with no city” list, and has no City on the Details tab. But the address is Pedi Khola, and “Move to other city” already has Pedi Khola filled in. However, Pedi Khola isn’t usually an available option for a City, and doesn’t appear on the list of cities in Nepal on https://streetartcities.com/cities/continents/asia
Checking other other examples above, they also follow the same pattern. It looks like it some cases the system is deriving the city from the address, and others it uses a structured City field.
So my current guess is that “move to other city” is trying to be helpful in cases where there’s an address, but then failing because it’s generating a default option that doesn’t exist in the system.