acf cache workaround

acf-cache-workaround.php

<?php

call_user_func(function(){
  $purge = function ($post_id) {
    if ('acf' === get_post_type($post_id) && !wp_is_post_revision($post_id)) {
      wp_cache_delete('field_groups', 'acf');
    }
    return $post_id;
  };
  
  foreach (array('save_post') as $hook) {
    add_action($hook, $purge, 999);
  }
});