Cannot allow annonymous content creation for hook_node_info defined types

I have a module which defines a content type, based on node_example.module. I want anonymous users to be able to create nodes of this type, protected by CAPTCHA. When I set "create story content" for anonymous users, /node/add works correctly, but when I set the permission "create school" (see code below) for anonymous, it seems like Drupal ignores me!

Drupal 6.1.4
CAPTCHA 6.x-2.0-rc3

/**
 * Implements hook_perm().
 */
function school_perm() {
  return array('create school', 'edit own school', 'delete own school', 'edit any school', 'delete any school');
}

/**
 * Implements hook_node_access().
 */
function school_access($op, $node, $account) {
  if ($node->type == 'school') {
    switch ($op) {
      case 'create':
        return user_access('create school', $account);
        break;
      case 'update':
        return (user_access('edit any school', $account) || (user_access('edit own school', $account) && ($account->uid == $node->uid)));
        break;
      case 'delete':
        return (user_access('delete any school', $account) || (user_access('delete own school', $account) && ($account->uid == $node->uid)));
        break;
    }
  }
}