Default view mode cannot be locked

I'm using the Group module. I followed the documentation closely, but could not achieve protection. I had to dig through the issue queue to find this detail.

Group does not come with a "Full" view by default. I had to add it manually and enable protection on it. Then protection was taking place.

Re-opening this issue as a documentation task.

And thank you for this great module!

To fix the problem I simply unset entity_access_password_entity_view_mode_alter() and replaced it with a custom implementation where I added a single line:

  $password_check_view_mode = $view_mode == 'full' ? 'default' : $view_mode;

Here is the full code.

/**
 * Implements hook_module_implements_alter().
 */
function project_backend_module_implements_alter(&$implementations, $hook) {
  // This contrib hook implementation is replaced
  // with project_backend_entity_view_mode_alter().
  if ($hook == 'entity_view_mode_alter') {
    unset($implementations['entity_access_password']);
  }
}

/**
 * Implements hook_entity_view_mode_alter().
 */
function project_backend_entity_view_mode_alter(string &$view_mode, EntityInterface $entity): void {
  // Quick return to avoid instantiation.
  if ($view_mode == PasswordAccessManagerInterface::PROTECTED_VIEW_MODE) {
    return;
  }
  // Password access field treats 'full' view mode as 'default'.
  // So we need to explicitly pass the 'default' value.
  $password_check_view_mode = $view_mode == 'full' ? 'default' : $view_mode;
  /** @var PasswordAccessManagerInterface $password_access_manager */
  $password_access_manager = \Drupal::service('entity_access_password.password_access_manager');
  if ($password_access_manager->isEntityViewModeProtected($password_check_view_mode, $entity)) {
    $entity->addCacheContexts([EntityIsProtectedCacheContext::CONTEXT_ID . ':' . $entity->getEntityTypeId() . '||' . $entity->id() . '||' . $view_mode]);

    if (!$password_access_manager->hasUserAccessToEntity($entity)) {
      $view_mode = PasswordAccessManagerInterface::PROTECTED_VIEW_MODE;
    }
  }
}