One place to look at is Mirboo. I've just picked it to avoid yielding too much PII, but it barely respects the existence of surrounding rural districts. (It might even swamp them like others I know - I'm afraid I don't have my full system here.) I know of other examples (locations to which I have an attachment), but you'll forgive me if I avoid giving too much PII on a public forum.
I'm afraid I can't give an exhaustive list because I haven't produced one. Also because I anticipate that if I produce a report it will come to nothing - I usually find that public databases are curated by people who will refuse to accept that any major corrections are necessary because they've already worked on the problem for years and therefore a major correction is taken to be an insult.
As an example, if I can only produce examples in rural areas, I fear that someone will say "we have thousands of correct addresses, but there's only twenty addresses affected by this example, and thirty by that example - it's not important enough". At that point it seems there's no point even producing a report. OSM will just fall into the category of useless databases, where, like Wikipedia, accuracy and convenience are not valued.