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Perhaps we should divide the examples list into one section for cases of it being the premise, and one for it occuring in the middle or end of a work? To avoid risk of spoilers, I mean.
How sure are we about the Anita Blank entry as a complete aversion? The series begins with vampires having just become recognized as citizens, with a long-going plot thread that most older vampires aren't comfortable with the newfangled idea of letting humans know they're there. A lot of vampire-related crimes are considered notable because the police actually find out about them (meaning that, as master vampires normally hide every trace of their presence, the crimes were left as messages).
The religious issues with necromancy and vampires, as well as lycanthrope integration and the existence of hate groups, never feel like they have any pedigree (Inquisition-era stuff aside). No references to earlier organizations or movements than the extant ones, no legal history, and the U.S. seems to have been founded identically to our own, as if nobody then knew there was anything to make provisions for. And even with university degree courses for preternatural biology and some form of witchcraft, there don't seem to be many people who aren't themselves paranormal who know anything accurate about the subject.
All in all, I'd always assumed that the Masquerade ended at most forty years ago in this verse, and that its ending was simply an Unusually Uninteresting Event. Maybe a case of everything leaking so quickly that nothing had the chance to break.
Removed the Ranma example, because it seems to be a case of Mundane Fantastic rather than The Unmasqued World (I'm not familiar with the show, so I don't know if there ever was a Masquerade in there):
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How well does it match the trope?