Bogus URL completion (“redirect_canonical”) in WP 4.7

  • Today I experienced something unnerving which I *hope* I’ve fixed.

    I’m running WP 4.7 and a TwentyTen child theme with a custom post type called “people” and a couple of relevant plugins (Advanced Custom Fields, Custom Post Type UI). Everything is freshly updated to the latest release.

    Today when I tried to go to a “people” URL like:

    https://example.com/people/joe-blow

    …WP instead showed me a media page associated with that person (an auto-generated page for the person’s photo in Media):

    https://example.com/people/joe-blow/joe-blow

    Through trial and error I fixed this by changing the permalink to an alternate spelling, loading it at that new URL, and then changing it back.

    That is, I did this:

    https://example.com/people/joe-blow
    renamed to ->
    https://example.com/people/joseph-blow
    renamed to ->
    https://example.com/people/joe-blow

    I should add that a lot of my custom post type pages were throwing “404 Not Found” errors shortly before I discovered this. I fixed that problem (again through trial and error) by deactivating and re-activating all the relevant plugins.

    Whew. Now everything *appears* to be working correctly. But how can I be sure? Is this a known bug? Is there a recognized way to give the “redirect_canonical” URL completion a kick in the head and get it to rebuild its index?

    (I’m so tempted to just shut it off and have an intelligent 404 page instead, but that’s a separate topic…)

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