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I searched using the duckduckgo.com site, you mention you had to change your default search engine so I assume you were entering your search query to the URL field or the dedicated search field (depending on your browser)
When I tried just now again on a different machine, it no longer seems to work. I also found this commit on the help page which I think is where references to the other operators were removed and it's dated for march 3rd, so I think it might be that either the search site was cached somehow or it was not yet updated, which could explain why there was inconsistent behavior between users.