CAC user registration no longer works as of 23.0.7-bb.1

As of Big Bang 2.23.0, which includes Keycloak release 23.0.7-bb.1, user registration with a CAC no longer works.

The browser displays message "An internal server error has occurred."

Associated log from the keycloak pod:

2024-03-27 20:09:00,035 ERROR [org.keycloak.services.error.KeycloakErrorHandler] (executor-thread-3) Uncaught server error: java.lang.IllegalArgumentException: issuerCertificate cannot be null