magento2 – Magento 2 : Guest Add to cart items not showing

I am creating a cart as a guest cart and adding items to it and its working fine and the API is showing items in the guest cart in POSTMAN.

The issue is that the items are not showing in the browser on the cart page which is '/checkout/cart/' URL.

How can I be able to see the items of the guest cart in the browser?

Note: I am using the default Luma theme.