at every step, we’re not displaying a spinner because of next
We display a spinner because the data to load a component still needs to be loaded. For example, when you gt into payment details through delivery mode, there was spinner on the payment methods because the data for the component is still not set

so the flow for this step was if component data (payment method is not done being loaded), then display a spinner

the request is fired in order to fetch review page CMS data: