field types in the select list on the 'Add field' page are incorrectly sorted

The text field types are not in the correct order.

The code responsible for this is this in CategorizingPluginManagerTrait:

  public function getSortedDefinitions(array $definitions = NULL, $label_key = 'label') {
    // Sort the plugins first by category, then by label.
    /** @var \Drupal\Core\Plugin\CategorizingPluginManagerTrait|\Drupal\Component\Plugin\PluginManagerInterface $this */
    $definitions = isset($definitions) ? $definitions : $this->getDefinitions();
    uasort($definitions, function ($a, $b) use ($label_key) {
      if ($a['category'] != $b['category']) {
        return strnatcasecmp($a['category'], $b['category']);
      }
      return strnatcasecmp($a[$label_key], $b[$label_key]);
    });
    return $definitions;
  }

I've not yet managed to figure out why the sorting is incorrect.