Incorrect notice language specific field types missing

After updating search api I got the following notice:

There are some language-specific field types missing in schema of Solr server xyz: zh-hans.

This language specific field type is present in the solr config under text_zh_hans.

The code is checking for text_zh-hans.

/**
* {@inheritdoc}
*/
public function getSchemaLanguageStatistics() {
// @todo iterate over all indexes in case of cloud?
$available = $this->getSolrConnector()->pingCore();
$stats = [];
foreach (\Drupal::languageManager()->getLanguages() as $language) {
$solr_field_type_name = 'text' . '_' . $language->getId();
$stats[$language->getId()] = $available ? $this->isPartOfSchema('fieldTypes', $solr_field_type_name) : FALSE;
}
return $stats;
}

So the language check of language ids with a dash can't work.. Further in the code I saw something like this in the setSpellcheck method using data from getSchemaLanguageStatistics.
// Convert zk-hans to zk_hans.
$dictionaries[] = str_replace('-', '_', $language_id);

Maybe do this in getSchemaLanguageStatistics ..