Input description div is missing classes if put before input

https://cgit.drupalcode.org/bootstrap/tree/templates/input/form-element....

For some reason if you put description before input you don't get any classes for the div. I'm guessing nobody noticed because it's not possible to put the description before input easily. I do it like this in theme file:

/**
 * Implements hook_element_info_alter().
 */
function THEME_element_info_alter(array &$info) {
  // @todo: add more fields here.
  $info['email']['#description_display'] = 'before';
  $info['select']['#description_display'] = 'before';
  $info['textarea']['#description_display'] = 'before';
  $info['textfield']['#description_display'] = 'before';
}