Custom post template based on a single category

Hi Enfold team,
I have an issue using the Avia Advanced Editor.
I would like to filter posts based on category ‘private’.
I copied the single.php file in my child theme folder.
I added this code around the loop:

if ( in_category('private') && !is_user_logged_in() ) {
						
						get_template_part( 'includes/private' );

                     } else {
                    /* Run the loop to output the posts.
                    * If you want to overload this in a child theme then include a file
                    * called loop-index.php and that will be used instead.
                    *
                    */

                        get_template_part( 'includes/loop', 'index' );
						
                        //show related posts based on tags if there are any
                        get_template_part( 'includes/related-posts');

                        //wordpress function that loads the comments template "comments.php"
                        comments_template();
                     }

and I created a file private.php in ‘include’ folder with custom code inside.
Everything is fine, until the post uses Basic Editor, but when I switch to Advanced Editor, it seems that single.php is no more used as template.

Thank you for your help.
Riccardo