Assign automatically main category when subcategory is selected

Seems as this snippet is working in Gutenberg:

add_action('save_post','ac_assign_cat');
add_action('the_post', 'ac_assign_cat');
add_action('draft_to_publish', 'ac_assign_cat');
add_action('new_to_publish', 'ac_assign_cat');
add_action('pending_to_publish', 'ac_assign_cat');
add_action('future_to_publish', 'ac_assign_cat');
function ac_assign_cat() {
$post_id = get_the_ID();
$post_categories = wp_get_post_categories( $post_id );
$cats = array();
foreach($post_categories as $c){
       $cat = get_category( $c );
       $cats[] = $cat->parent;
}
wp_set_post_categories( $post_id, $cats, true );
}

This one gives some JS Console errors:

/*
Plugin Name: Parent Category Toggler
Plugin URI: http://wordpress.org/extend/plugins/parent-category-toggler/
Description: Automatically toggle the parent categories when a sub category is selected.
Version: 1.3.4
Author: Ben Lobaugh
Author URI: http://ben.lobaugh.net
Original Author: Aw Guo
Original Author URI: http://www.ifgogo.com
Licence: GPL
*/
function super_category_toggler() {
       
       $taxonomies = apply_filters('super_category_toggler',array());
       for($x=0;$x<count($taxonomies);$x++)
       {
              $taxonomies[$x] = '#'.$taxonomies[$x].'div .selectit input';
       }
       $selector = implode(',',$taxonomies);
       if($selector == '') $selector = '.selectit input';
       
       echo '
              <script>
              jQuery("'.$selector.'").change(function(){
                     var $chk = jQuery(this);
                     var ischecked = $chk.is(":checked");
                     $chk.parent().parent().siblings().children("label").children("input").each(function(){
var b = this.checked;
ischecked = ischecked || b;
})
                     checkParentNodes(ischecked, $chk);
              });
              function checkParentNodes(b, $obj)
              {
                     $prt = findParentObj($obj);
                     if ($prt.length != 0)
                     {
                      $prt[0].checked = b;
                      checkParentNodes(b, $prt);
                     }
              }
              function findParentObj($obj)
              {
                     return $obj.parent().parent().parent().prev().children("input");
              }
              </script>
              ';
       
}
add_action('admin_footer-post.php', 'super_category_toggler');
add_action('admin_footer-post-new.php', 'super_category_toggler');

Can you please test first one, and report back if it works for you. Thank you.