[wp-trac] [WordPress Trac] #40436: Custom taxonomy terms order lost under wp-admin/post.php edit action for a custom post type

[WordPress Trac]

#40436: Custom taxonomy terms order lost under wp-admin/post.php edit action for a
custom post type
----------------------------+-----------------------------
 Reporter:  solo14000       |      Owner:
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  Taxonomy        |    Version:  4.7
 Severity:  normal          |   Keywords:
  Focuses:  administration  |
----------------------------+-----------------------------
 Hi,

 I have registered a custom taxonomy (for a custom post type) that supports
 sorting using the following taxonomy args

 {{{#!php
         const DEFAULT_ARGS = [
                 'public'                                => true, // Make
 WP function is_tax() working for this custom taxonomy
                 'show_ui'                               => true,
                 'show_in_menu'                  => true,
                 'show_in_nav_menus'             => false,
                 'show_tagcloud'                 => false,
                 'show_in_quick_edit'    => true,
                 'meta_box_cb'                   => null, // If null
 default to WP post_tags_meta_box() in not 'hierarchical' otherwise to
 post_categories_meta_box() (see WP meta-boxes.php)
                 'show_admin_column'             => true,
                 'hierarchical'                  => false,
 // 2017-01-25 Seems not to be necessary anymore
 'update_count_callback' => 'My_Query_Admin::cb_update_count_callback',
                 'query_var'                             => true, // Make
 WP function is_tax() working for this custom taxonomy
                 'rewrite'                               => false,
                 'capabilities'                  => [],
                 'sort'                                  => true, // Need
 by post terms ordering for M_Post_Type::get_main_term()
 (https://core.trac.wordpress.org/ticket/5857)
                 '_builtin'                              => false,
         ];
 }}}

 I used the following args for registering the custom post type


 {{{
         // Default custom post type arguments
         //
 https://codex.wordpress.org/Function_Reference/register_post_type
         const DEFAULT_ARGS = [
                 'description'                   => '',
                 'public'                                => false,
                 'exclude_from_search'   => true,
                 'publicly_queryable'    => true,
                 'show_ui'                               => true,
                 'show_in_nav_menus'             => false,
                 'show_in_menu'                  => true,
                 'show_in_admin_bar'             => true,
 //              'capability_type'               => 'post',
 //              'capabilities'                  => [],
 //              'map_meta_cap'                  => false,
                 'hierarchical'                  => false,
                 'supports'                              => [
                         'title',
                         'editor',
                         'thumbnail',
                         'custom-fields',
                 ],
                 'register_meta_box_cb'  => null,
                 'has_archive'                   => false,
                 'rewrite'                               => false,
                 'permalink_epmask'              => EP_PERMALINK,
                 'query_var'                             => true,
                 'can_export'                    => false,
                 'delete_with_user'              => false,
                 'show_in_rest'                  => false,
 //              'rest_base'                             => $post_type,
 //              'rest_controller_class' => WP_REST_Posts_Controller,
 //              '_builtin'                              => false,
                 '_edit_link'                    => 'post.php?post=%d',
         ];
 }}}

 Terms order is well respected using

 {{{#!php

 wp_get_object_terms($post->ID, $taxonomy, ['orderby' => 'term_order']);
 }}}


 but when editing post under admin panel, order is lost and reverts always
 to alphabetical order.

 Can anyone confirm that bug or tell me what's wrong for me?

 Thanks a lot

--
Ticket URL: <https://core.trac.wordpress.org/ticket/40436>
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