upgrader_process_complete filter not fired using ajax updates

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There’s two thing that relates to this concern.

  1. The upgrader_process_complete action doesn’t fire when the updater is running in bulk mode, aka multiple plugin updates.
    ref: https://core.trac.wordpress.org/browser/tags/6.0/src/wp-admin/includes/class-wp-upgrader.php#L826
// @see https://core.trac.wordpress.org/browser/tags/6.0/src/wp-admin/includes/class-wp-upgrader.php#L826
// @line 826 - 841.

if ( ! $options['is_multi'] ) {
   do_action( 'upgrader_process_complete', $this, $options['hook_extra'] );
}
  1. The wp_ajax_update_plugin function, which is responsible for handing the ajax request performs the each plugin upgrade in bulk mode.
    ref: https://core.trac.wordpress.org/browser/tags/6.0/src/wp-admin/includes/ajax-actions.php#L4547
// @see https://core.trac.wordpress.org/browser/tags/6.0/src/wp-admin/includes/ajax-actions.php#L4547
// Line 4545 - 4547.

$skin     = new WP_Ajax_Upgrader_Skin();
$upgrader = new Plugin_Upgrader( $skin );
$result   = $upgrader->bulk_upgrade( array( $plugin ) );