[wp-trac] [WordPress Trac] #46482: Non-hierarchical taxonomies using checkbox display are not saving in quick edit

[WordPress Trac]

#46482: Non-hierarchical taxonomies using checkbox display are not saving in quick
edit
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 Reporter:  mooberrydreams  |      Owner:  (none)
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  Taxonomy        |    Version:  5.1
 Severity:  normal          |   Keywords:
  Focuses:                  |
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 **What steps should be taken to consistently reproduce the problem?**
 1) Register a custom taxonomy with these arguments to make a non-
 hierarchical taxonomy use checkbox display***:

 {{{
 'meta_box_cb' => 'post_categories_meta_box',
 'meta_box_sanitize_cb' => 'taxonomy_meta_box_sanitize_cb_checkboxes'
 }}}

 *** ''I am aware it does not display this way with Gutenburg, but not
 everyone uses Gutenburg and CPTs do not use Gutenburg''

 2) Quick Edit a post of a post type that uses the custom taxonomy

 3) Add terms to the custom taxonomy

 4) Click Update


 **What is the expected output or result? What did you see instead?**

 The terms entered into taxonomy field should be added to the post.
 Instead, all terms are removed from the post for this taxonomy.

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Ticket URL: <https://core.trac.wordpress.org/ticket/46482>
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