Issue in Wordpress programmatically created product filter on shop page

Question

I am creating products in WordPress programmatically. Everything seems ok but the shop page filter by attribute name is not working with these products.

If we open these products in wp-admin and save attributes then it is working.

I am not sure what is the issue.

function addAttributes($product_id, $attributes){
    $product_attributes = array();
    foreach( $attributes as $key => $terms ){
        
        $taxonomy = wc_attribute_taxonomy_name($key); // The taxonomy slug
        $attr_label = ucfirst($key); // attribute label name
        $attr_name = ( wc_sanitize_taxonomy_name($key)); // attribute slug
        // NEW Attributes: Register and save them
        if( ! taxonomy_exists( $taxonomy ) ){
            $crRes = save_product_attribute_from_name( $attr_name, $attr_label );
        }
            

        $product_attributes[$taxonomy] = array (
            'name'         => $taxonomy,
            'value'        => '',
            'position'     => '',
            'is_visible'   => 1,
            'is_variation' => 0,
            'is_taxonomy'  => 1
        );

        
        //foreach( $terms as $value ){
            echo "value >>>"; print_r($terms);
            if(empty($terms)) continue;
            $term_name = ucfirst($terms);
            $term_slug = sanitize_title($terms);

            // Check if the Term name exist and if not we create it.
            if( ! term_exists( $terms, $taxonomy ) )
                wp_insert_term( $term_name, $taxonomy, array('slug' => $term_slug ) ); // Create the term
           
            // Set attribute values
            echo  "product_id ".$product_id." ; term_name ".$term_name." ; taxonomy ".$taxonomy;
            $upRes = wp_set_post_terms( $product_id, $term_name, $taxonomy, true );
            echo "upRes";
       
    }
    update_post_meta( $product_id, '_product_attributes', $product_attributes );
    $product = new WC_Product_Variable( $product_id );
    $product->save();

}