[wp-trac] [WordPress Trac] #35173: in_category function doesn't work after update to WP 4.4

[WordPress Trac]

#35173: in_category function doesn't work after update to WP 4.4
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 Reporter:  artem.kolotilkin  |      Owner:
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  Taxonomy          |    Version:  4.4
 Severity:  normal            |   Keywords:
  Focuses:                    |
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 After updating to WP 4.4 "in_category" function no longer works. I was
 able to trace the issue to "is_object_in_term" function:
 https://github.com/WordPress/WordPress/blob/4.4/wp-
 includes/taxonomy.php#L4520

 In that function "get_object_term_cache" returns empty array instead of
 correct terms from cache. Because it's an empty array and not false value,
 it doesn't try to load terms from DB, thus "in_category" function returns
 false, although term is assigned to a post.

 Downgrading to WP 4.3.1 fixes the problem.

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Ticket URL: <https://core.trac.wordpress.org/ticket/35173>
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