Error: Call to undefined function Drupal\webform\Hook\_webform_token_get_submission_value()

When using the [webform_submission:values] token (e.g. in a notification email handler at /admin/structure/webform/manage/contact/handlers) and submit the webform I get the following php error:

Error: Call to undefined function Drupal\webform\Hook\_webform_token_get_submission_value() in Drupal\webform\Hook\WebformTokensHooks->tokens() (line 660 of /web/modules/contrib/webform/src/Hook/WebformTokensHooks.php).

The issue is that the webform.tokens.inc file is not included.