Using lang parameter with multiple languages not working

[HPiirainen]

When Polylang is active, if I manually add 'lang' => 'fi,en' to query params, RediPress duplicates the query:

(@taxonomy_slug_language:{'fi,en'}) ... (@taxonomy_slug_language:{'fi'|'en'})

Seems like it handles both the lang param and the subsequent tax query added by Polylang. Running that query with RediPress disabled works correctly.

This can be circumvented by not setting the lang param and adding the language(s) with tax_query, but would be great if the Polylang-native way would be supported out-of-the-box.