Sort products without thumbnail in WooCommerce shop page

I would like to create a function that instead of hiding the products without thumbnails, would be ordered in such a way that the products with the highlighted image appear first on the shop page while those without the highlighted image appear at the end. I tried to modify an already existing function:

    function woocommerce_product_query( $q ) {
        $q->set( 'meta_key', '_thumbnail_id' );
        $q->set('orderby', 'meta_value_num');
        $q->set('order', 'DESC');
    }
    add_action( 'woocommerce_product_query', 'woocommerce_product_query' );

I tried adding orderby to this already existing function too but nothing happens, keep hiding the products from me.

In this photo the function only hides the products without thumbnail.
I don’t know how to solve …

I would try to rename the custom function and add meta_query too! So it’d be like this:

function my_shop_custom_products_query( $q ) {
        $q->set( 'meta_key', '_thumbnail_id' );
        $q->set('orderby', 'meta_value_num');
        $q->set('order', 'DESC');
        $q->set( 'meta_query', array( array(
           'key' => '_thumbnail_id',
           'compare' => '>=',
           'value' => '0'       
        )));
}

add_action( 'woocommerce_product_query', 'my_shop_custom_products_query' );

If for some reason it didn’t work, then try to replace meta_value_num with meta_value and see if that’d work!