Change the order items admin product link to the product permalink frontend in WooCommerce.

change-order-items-admin-product-link-to-the-product-permalink-front.php

add_action( 'woocommerce_before_order_itemmeta', 'add_admin_order_item_product_permalink', 10, 2 );
function add_admin_order_item_product_permalink( $item_id, $item ) {
    if( $item->get_type() !== 'line_item' ) 
        return;

    $product = $item->get_product();

    // Add a hidden input field with the product permalink
    printf( '<input type="hidden" name="product-permalink" value="%s">', esc_url($product->get_permalink()));
}

// Change order items admin product link to the product frontend permalink
add_filter( 'admin_footer', 'admin_order_items_with_product_permalink_js' );
function admin_order_items_with_product_permalink_js() {
    global $pagenow, $typenow; 

    if ( ( $pagenow === 'post.php' && $typenow === 'shop_order' ) 
    || ( $pagenow === 'admin.php' && isset($_GET['page'])  && isset($_GET['action']) 
    && $_GET['page'] === 'wc-orders' && $_GET['action'] === 'edit' ) ) :
    ?>
    <script>
    jQuery('#order_line_items tr').each(function(){
        jQuery(this).find('td.name a').prop('href', jQuery(this).find('input[name=product-permalink]').val());
    });
    </script>
    <?php
    endif;
}