Validation check required not working when using type="post"

Hello,

'type'      	=> 'post',
   'post_type' 	=> 'cpt_test',
   'field_type'  	=> 'select_advanced',
   'multiple'    	=> true,
   'placeholder' 	=> __( 'Select an Item', 'seo-monitor' ),
   // Query arguments
   'query_args'  => array(
                          'post_status'    => 'publish',
                          'posts_per_page' => - 1,
   )

and then validation rule: required is not working, you can submit post without choosing a custom post type. Is this a known bug or did i something wrong?

By the way i have the same problem with type=”checkbox_list” (then the red star is also missing)

Thanks for your help.

https://www.ads-software.com/plugins/meta-box/