Post per page in Meta Query not working

I need to see 10 posts of each CPT actor each time, but this code doesn’t work. It get all the posts.

Is it correct to use ‘posts_per_page’ => 10 ?

$name = $post->post_name; //get the slug of the current CPT actors 
$args = array(
'post_type' => 'post',
'posts_per_page' => 10,
'meta_query' => array(array(
	'key' => 'actors',
        'value' => $post->ID,
	'compare' => 'IN',
	),
),
);

$loop = new WP_Query($args)