Issue with checkout page after auto update to 6.2.2

My site auto updated to WordPress 6.2.2 last week and the cart started freezing. To find the problem I’ve switched to the storefront theme and deactivated all the plugins except Woocommerce Version 7.8.0.

This is a dev site, as I’ve deferred the update on the live site for the time being, so thats still working OK. But I can only defer for a month, so need to fix before the live site updates again.

I’d we really grateful if anyone had any ideas?

The page I need help with: [log in to see the link]