- π³πΏNew Zealand quietone New Zealand
The functions in the title were removed from core and replaces in the ThemeHandler service. And the rebuilding of the theme data is deprecated in Drupal 10, to be removed in Drupal 12. There is more information int the following change records.
https://www.drupal.org/node/2150863 β
https://www.drupal.org/node/3413196 βTherefor, closing as outdated.