See https://libris.kb.se/katalogisering/q71x11h219zfb8j#it

The problem is that there's two titles, a regular one and a "cover title".

[{'@type': 'Title', 'mainTitle': 'Göteborgs gatunamn 1621 t o m 2000', 'marc:searchElement': False},
{'@type': 'CoverTitle', 'mainTitle': 'Göteborgs gatunamn 1621-2000', 'marc:searchControl': 'marc:NoteAddedEntry'}]

Originally we ignored entries with >1 title. Change is so that if there's more than one… use the cover title? Because that's what it actually says on the cover.