Hi Gareth,
Thanks so much for your report and welcome to the forum!
We’re already working on this issue. As is so often the case with WooCommerce, the change caught us off guard.
As @clickfusion63 already said: insert the “old” shortcodes on the corresponding pages, then it will work as expected.
Cart page
[woocommerce_cart]
Checkout page
[woocommerce_checkout]
Best regards,
timmse