WooCommerce无法识别子主题文件

Question

我正在尝试在WooCommerce中修改single-product.php模板。我按照以下步骤操作：

1）通过将WooCommerce主题支持添加到子主题函数中来声明它。

    add_theme_support( 'woocommerce' );
    }
    add_action( 'after_setup_theme', 'add_woocommerce_support' );

2）创建一个新的single-product.php模板。我在/child-theme/woocommerce/single-product.php中创建此文件。该文件如下所示，它与默认模板相同，只是使用do_shortcode函数在底部添加了一些内容

<?php
/**
 * The Template for displaying all single products
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/single-product.php.
 *
 * HOWEVER, on occasion WooCommerce will need to update template files and you
 * (the theme developer) will need to copy the new files to your theme to
 * maintain compatibility. We try to do this as little as possible, but it does
 * happen. When this occurs the version of the template file will be bumped and
 * the readme will list any important changes.
 *
 * @see         https://docs.woocommerce.com/document/template-structure/
 * @package     WooCommerce/Templates
 * @version     1.6.4
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit; // Exit if accessed directly
}

get_header( 'shop' ); ?>

    <?php
        /**
         * woocommerce_before_main_content hook.
         *
         * @hooked woocommerce_output_content_wrapper - 10 (outputs opening divs for the content)
         * @hooked woocommerce_breadcrumb - 20
         */
        do_action( 'woocommerce_before_main_content' );
    ?>

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

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

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

    <?php
        /**
         * woocommerce_after_main_content hook.
         *
         * @hooked woocommerce_output_content_wrapper_end - 10 (outputs closing divs for the content)
         */
        do_action( 'woocommerce_after_main_content' );
    ?>

    <?php
        /**
         * woocommerce_sidebar hook.
         *
         * @hooked woocommerce_get_sidebar - 10
         */
        do_action( 'woocommerce_sidebar' );
    ?>

<?php echo do_shortcode('[insert page="our-formulas-banner" display="content"]' ); ?>
<?php get_footer( 'shop' );

/* Omit closing PHP tag at the end of PHP files to avoid "headers already sent" issues. */

如果我在父主题文件中执行此操作，但不读取子主题文件，则此方法正常。有什么想法吗？