Thank you for the screenshots. That’s very helpful!
I need to point that CartBounty does not rely or use in any way WooCommerce Cart block since there is not input (if you see it differently, please let us know).
As to default WooCommerce Checkout block – I mentioned earlier that we have tested adding this block in a sidebar and in a separate page. CartBounty was able to saves contact details and we were unable to find any issues.
Are you using any custom themes or some sort of custom checkout plugins or anything else that is changing how your default WooCommerce Checkout block looks and works?
The example of your checkout block that you shared in a screenshot seems to differ from default WooCommerce checkout page or block so we need to know if you are using some custom theme or a custom plugin for Checkout form that does not add “billing_email” and “billing_phone” ID values to corresponding input fields. You could try to inspect the code yourself if these ID values are there?
If you could provide a link to your checkout page, we could quickly understand the issue where is it coming from and how to resolve it.
So far this seems to be either theme or some custom checkout plugin related issue at this point.
Best,
Nauris