Hello, I am having the same issue. Whenever a guest adds an item to heir cart and tries to checkout, the cart is empty.
I also have a message in the backend that states “Your theme has bundled outdated copies of WooCommerce template files – if you encounter functionality issues on the frontend this could be the reason. Ensure you update or remove them (in general we recommend only bundling the template files you actually need to customize). See the system report for full details.”
I’ve updated WooCommerce on multiple occasions, but this message still remains and I suspect it is the reason why guests cannot checkout.
Please fix. I am losing customers as we speak.