Breadcrumb for Hirerchial Custom Post-type

Hello,

Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.

In this case, please try adding and customizing this filter to your site to add the parent page in the breadcrumbs:

add_filter( 'rank_math/frontend/breadcrumb/items', function( $crumbs, $class ) {
	global $post;
	$post_type = get_post_type();
	if ($post_type == 'custom_post_type') { //change the value inside '' to your actual CPT name
		$parent = get_post_parent();
		if($post->post_parent) {
			$crumbs[2][0] = get_the_title($parent);
			$crumbs[2][1] = get_the_permalink($parent); 
			$crumbs[3][0] = get_the_title();
			return $crumbs;	
		}
	}
	return $crumbs;
}, 10, 2);

And here’s a guide to adding the code to the website:
https://rankmath.com/kb/wordpress-hooks-actions-filters/

Hope that helps.

Thank you.