Update Variable default value as per core function on plugin file

[nirajbsa]

Hi can someone please help to update core function variables default value as per core function?

Core code
https://github.com/magento/magento2/blob/2.4-develop/app/code/Magento/Checkout/Model/PaymentInformationManagement.php

https://github.com/experius/Magento-2-Module-Experius-ExtraCheckoutAddressFields/blob/master/Plugin/Magento/Checkout/Model/PaymentInformationManagement.php

Need to set default value to null to avoid errors on log/debug file