Error parsing jboss-ejb3.xml during deployment after upgrade to EAP 6.4

Issue

• jboss-ejb3.xml parse error during deployment after upgrade to JBoss 6.4.5 from Jboss 6.2.0

ERROR [org.jboss.msc.service.fail] (MSC service thread 1-7) MSC000001: Failed to start service jboss.deployment.unit."example.war".PARSE: org.jboss.msc.service.StartException in service jboss.deployment.unit."example.war".PARSE: JBAS018733: Failed to process phase PARSE of deployment "example.war"
        at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:166) [jboss-as-server-7.5.5.Final-redhat-3.jar:7.5.5.Final-redhat-3]
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1980) [jboss-msc-1.1.5.Final-redhat-1.jar:1.1.5.Final-redhat-1]
        ...
Caused by: org.jboss.as.server.deployment.DeploymentUnitProcessingException: JBAS014185: Exception while parsing jboss-ejb3.xml: /example.war/WEB-INF/jboss-ejb3.xml
        at org.jboss.as.ejb3.deployment.processors.EjbJarParsingDeploymentUnitProcessor.parseJBossEjb3Xml(EjbJarParsingDeploymentUnitProcessor.java:283)
        ...
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[33,13]
Message: Unexpected element '{http://java.sun.com/xml/ns/javaee}ejb-name' encountered
        ...

• Why there is a parsing error if I upgrade to EAP 6.4.x or later?
• The jboss-ejb3.xml marked muliple EJB's as clustered but it seems not all are handled correct

<jee:assembly-descriptor>
    <c:clustering>
        <jee:ejb-name>my.example.FirstBean</jee:ejb-name>
        <jee:ejb-name>my.example.SecondBean</jee:ejb-name>
        <c:clustered>true</c:clustered>
    </c:clustering>
</jee:assembly-descriptor>