Main loop is not working in some cases with "Post Featured Image" block

[engahmeds3ed]

Steps to reproduce:

1. Create a post that has the block "Post Featured Image"
2. Use the following snippet

   <?php
   add_action( 'wp_head', function () {
           if ( ! is_singular() ) {
                   return;
           }
   
           $post = get_queried_object();
           apply_filters( 'the_content', $post->post_content );
   } );
   

3. Visit the created post page in frontent.
4. You will find the page content part is empty.

I believe this is because:

​https://github.com/WordPress/wordpress-develop/blob/07fc9b2d7449314ee658d764ce162e99cef6783b/src/wp-includes/blocks/post-featured-image.php#L24-L26

We are outside the loop (inside wp_head hook), the function the_post will be called and then $wp_query->current_post will be increased from -1 to be 0 so the next loop (main content loop) will not fire because of that.

[annashopina]

Duplicate of #58027.

[annashopina]

The task was linked with https://core.trac.wordpress.org/ticket/58027 for future investigation. Looks like they are duplicated.