Redirect After Creating New Taxonomy Term
To add a redirection after creating new Taxonomy Term I suggest using the hook_preprocess_HOOK() in the MYTHEME.theme file.
E.g. here is code that add redirection back to the Vocabulary - list of all terms - for the Add term button:
/**
 * Implements hook_preprocess_HOOK() for menu-local-action templates.
 */
function MYTHEME_preprocess_menu_local_action(array &amp;$vars) {
  if ($vars['link']['#title'] == 'Add term') {
    // Add redirection to the Terms list after creating a new term.
    $destination = Url::fromRoute('&lt;current&gt;')-&gt;toString();
    $vars['link']['#options']['query']['destination'] = $destination;
  }
}