Custom Post Types and add_rewrite_endpoint doesn't work together

Hello,

There are any chances to use add_rewrite_endpoint on a custom post_type?
Seems to work well on general posts but on custom ones it gets redirected to canonical url.

Also, after disable the canonical redirect everything is well. But I want to keep that filter.
remove_filter('template_redirect', 'redirect_canonical');

Any thoughts? Here’s my code:

function add_q_var() {
    global $wp;
    $wp->add_query_var('test');
}

add_filter('init', 'add_q_var');
add_rewrite_endpoint('test', array(EP_NONE));

Thank you.