[wp-trac] [WordPress Trac] #28099: Empty array passed to WP_Query post__in returns posts

[WordPress Trac]

#28099: Empty array passed to WP_Query post__in returns posts
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 Reporter:  danielbachhuber          |       Owner:  wonderboymusic
     Type:  defect (bug)             |      Status:  reopened
 Priority:  normal                   |   Milestone:  Awaiting Review
Component:  Query                    |     Version:
 Severity:  normal                   |  Resolution:
 Keywords:  2nd-opinion needs-patch  |     Focuses:
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Comment (by sc0ttkclark):

 I haven't determined what code changed here to cause `post__in` to fail
 like that. I just ran tests on WP 6.3 and `'post__in' => [ 0 ]` and that
 works fine (returns no posts as expected).

 Can anyone verify this independently, perhaps @Youdaman has a plugin or
 theme that is filtering pre_get_posts or something and running something
 akin to `array_filter()` on the `post__in` argument?

 We might be spinning wheels here.

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Ticket URL: <https://core.trac.wordpress.org/ticket/28099#comment:42>
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