[wp-trac] [WordPress Trac] #35031: wp_old_slug_redirect() in 4.4 redirecting existing posts

[WordPress Trac]

#35031: wp_old_slug_redirect() in 4.4 redirecting existing posts
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 Reporter:  douglsmith    |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Query         |    Version:  4.4
 Severity:  normal        |   Keywords:
  Focuses:                |
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 After updating to WordPress 4.4, I noticed that some of my existing pages
 were redirecting to other pages. The unique thing about these pages is
 that at one time they had been moved to a new slug and a new page was
 created and given the old slug.

 I have not been able to recreate this condition by adding a new page,
 changing the slug, then adding a new page at the original slug. Those
 older pages had a `_wp_old_slug` custom field set with the original URL
 but that is not being created as I move pages now. So this may only be an
 issue for sites with older page moves.

 I believe this behavior is caused by the removal of is_404() in [34659].
 It had previously stopped a redirect away from a post / page that
 currently exists, even if another post had its URL in a `_wp_old_slug`
 custom field.

 This is different from, but may be related to #35012.

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Ticket URL: <https://core.trac.wordpress.org/ticket/35031>
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