Filter YARPP by CPT don′t work

Hi,

I try many times but this don′t work:

<?php if(function_exists('related_posts')){
related_posts(array(
'post_type' => 'produkt',
'show_pass_post' => true,
'past_only' => false,
'threshold' => 0,
'template' => 'yarpp-template-produkt.php',
'limit' => 3,
'order' => 'score DESC'
), $post->ID , true);
} ?>

Works all parameters but post_type not, I also have installed YARPP Experiments and in the registration of the post_type set 'yarpp_support' => true.

Any idea why?

https://www.ads-software.com/plugins/yet-another-related-posts-plugin/