Thank you for your quick reply. I can understand the assumption that it should work as your test shows the correct result. But when I do some further tests, I find that when using TD composer adding the WooCommerce shortcode Woo Add to Cart makes the page fail. In fact, I removed everything from the page and obviously it shows a blank page with the header and footer, and more importantly no error. When I add the cart shortcode, the page fails.

Any suggestion on what I can do to troubleshoot?