Language filtering with sample endpoint



I am trying to filter in on the streaming API by keywords & languages independently. I am working with hbc 2.0.0 for Java. Problems occur when I want to filter in on languages.

When I filter on keywords + language, it works fine : the filter endpoint is used.
But when I only filter on language only, it doesn’t work : the sample endpoint is used. I get every possible language. I don’t think the language recognizer is broken because it works fine when I use the keywords with the filter endpoint.

What to do? Have you noticed this?

Thanks for your help