Get posts from one language not working

Hi chouby,

on my static frontpage I want to display posts from the current language. In your plugin documentation you write that you can do this with the following code:

$posts = get_posts(array(
    'post_type' => 'post',
    'lang' => 'fr', // use language slug in the query
    'showposts' => 5
));

When I add the lang param to my get_posts function, the returned array is empty. If I do not set the lang param, the systems returns posts from all languages. Can you help me?

My code:

$teasers = get_posts([
        'post_type' => 'post',
        'cat' => $category_id,
        'posts_per_page' => $parameters['small'] ? 2 : 3,
        'post__not_in' => [$featured_id],
        // 'lang' => get_query_var('lang')
        'lang' => 'de' // display just german posts
    ]);

https://www.ads-software.com/plugins/polylang/