When using language codes/slugs like 'nl-nl' the graphql return an enum error

[mauritsweebers]

Some websites need a double language code/slug.
nl-nl
nl-en
be-nl
be-fr
be-en

The graphql does not open when a language is configured this way.
it gives this php error en remains loading endlesly

Names must only contain [_a-zA-Z0-9] but "NL-NL" does not.

easy replicable by simply changing the code name of a language

It looks like a minor validation issue, but i can't trace it in the php

[mauritsweebers]

Seems this resolves the issue

$language_codes[str_replace('-', '_', strtoupper($lang))] = $lang;
but it hasn't been implemented

https://github.com/philJohnson/wp-graphql-polylang/blob/hotfix/LanguageCodes/src/PolylangTypes.php

[emanuelstrom]

This issue is still there. Maybe implementing the hotfix would be an idea? 😊