It is because of the Spryng API and PHP SDK implementation.
The Spryng API does not return the used card details at all in a createTransaction response.
The card property is initialized by the Spryng PHP SDK, which sets only the ID property for a card in a response:
https://github.com/spryngpayments/php/blob/e1f0225b9/src/Complexity/SpryngPaymentsApiPhp/Helpers/TransactionHelper.php#L49-L52
So for now we have to make an extra API request to get the card information.
Other payment services returns the used card details the charge response: see a Paymill response as an example.
It reduces the time of a purchase for a buyer.