[wp-trac] [WordPress Trac] #53620: add_meta_box $callback firing after publish or update but not updating dom html

[WordPress Trac]

#53620: add_meta_box $callback firing after publish or update but not updating dom
html
--------------------------+-----------------------------
 Reporter:  hedgehog90    |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  5.7.1
 Severity:  normal        |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 Basically, the callback in add_meta_box is firing after I update my post
 (got the spinning circle in the meta box header), returning new updated
 html, but the new html is not applied to the actual page.

 The following metabox just renders a random number:

 {{{#!php
 <?php
 add_action('admin_init', function () {
         // Add our meta box for the "post" post type (default)
         if ( current_user_can("send_notifications") ) {
                 $post_types = ["post", "go_live"];
                 foreach ($post_types  as $post_type) {
                         add_meta_box(
                                 'cabtv_notif_on_post',
                                 'Notifications',
                                 function ($post) {
                                         echo rand();
                                 },
                                 $post_type,
                                 'side',
                                 'high'
                         );
                 }
         }

 });
 }}}

 After the post is published / updated, the metabox should regenerate and a
 new random number should display... presumably... otherwise why is it
 called?

 I notice the entire wp-admin/post.php page is downloaded in the developer
 tools network tab after updating the post, and if I inspect the response I
 can see that the random number is different, however the original page
 remains the same.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/53620>
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