Cannot marshal a system property expression used with <socket-binding-group port-offset="">

If you use a configuration with this:

<socket-binding-group name="standard-sockets" default-interface="public" port-offset="${jboss.port.offset:100}">

it will fail with a org.jboss.as.controller.persistence.ConfigurationPersistenceException on any attempt to marshal the config back to disk following a change.