Show subcategories broken when WP/WC updates

I’ve been given to mantain a site who wasn’t updated for a while: it had WP 4.9.15 and WooCommerce 2.6.14

Now I’ve made a site test where i’ve updated all these things and now i have WP 5.4.2 and WC 4.3.1

One thing that is broken and i’m not able to figure why is the page showing the products by category: they have a 3 level category tree. It worked this way: if the category asked was a leaf, the page showed the product list. If it wasn’t a leaf, it showed all the subcategories.

The template page doing this is archive-product.php which has this simple loop to show everything:

            <h1 class="page-title"><?php woocommerce_page_title(); ?></h1>

            <?php if ( have_posts() ) : ?>

                <?php
                    /**
                     * woocommerce_before_shop_loop hook
                     *
                     * @hooked woocommerce_result_count - 20
                     * @hooked woocommerce_catalog_ordering - 30
                     */
                    do_action( 'woocommerce_before_shop_loop' );
                ?>

                <?php woocommerce_product_loop_start(); ?>

                    <?php woocommerce_product_subcategories(); ?>

                    <?php while ( have_posts() ) : the_post(); ?>

                        <?php wc_get_template_part( 'content', 'product' ); ?>

                    <?php endwhile; // end of the loop. ?>

                <?php woocommerce_product_loop_end(); ?>

                <?php
                    /**
                     * woocommerce_after_shop_loop hook
                     *
                     * @hooked woocommerce_pagination - 10
                     */
                    do_action( 'woocommerce_after_shop_loop' );
                ?>

            <?php elseif ( ! woocommerce_product_subcategories( array( 'before' => woocommerce_product_loop_start( false ), 'after' => woocommerce_product_loop_end( false ) ) ) ) : ?>

                <?php wc_get_template( 'loop/no-products-found.php' ); ?>

            <?php endif; ?>

Now this page works only if the category requested is a leaf thus it has to display a list of products. If the category requested is not a leaf, no subcategory is shown and the page is blank with only the category name (page_title) showing. So it means that the query is somewhat did good, but why no category is shown? Thank you if you can help me solving this trouble

Answers:

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Method 1

Found the answer myself, since WC 3.3 woocommerce_product_subcategories is deprecated and returns an empty value:

Link to woocommerce docs

So you have to implement your own subcategories list view. I used as hint the code found here and rebuild the categories page as it was before

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