As shown on https://github.com/wildfly/wildfly/pull/19400.

For instance, com.sun.faces.serializeServerState should always use 'false' to let the session manager control when session attributes are serialized and to not force JDK serialization of JSF state which is not obvious for non-SMEs.

IIUC there are also properties that are set explicitly, perhaps that's useful information for users as well.