private function fetchAlias($nodeId, $siteId)
    {
        // We have no source loaded yet, attempt to find it properly and
        // populate the cache, even if there's nothing to load
        $alias = $this->aliasManager->getPathAlias($nodeId, $siteId);

        $this->isModified = true;

        if ($alias) {
            $this->loaded[$nodeId][$siteId] = $alias;
        }

        return $alias;
    }