Coupon functionality broken when using shortcode to show checkout

The coupon field doesn’t seem to work when shortcodes are used to show the product page and the checkout on the same page (e.g. [product_page sku=”photosession”]
[woocommerce_checkout]) . Checkout shows up when a product is added to cart, as expected, and the ‘apply coupon’ bar is shown, but clicking on it just scrolls the page up, rather than allowing the user to enter the code.

I know you have a one page checkout plugin, but I’d be happy with what I’ve set up with the short codes, if the customer could actually enter the coupon code where it says they can and have it apply. I can see the form is there in the source code, it’s just the JS is not firing to show it, as it does on the actual checkout page. I can write some JS to do it myself, but it seems like broken functionality you might want to fix.