Why JBoss EAP 6.4 fail to load the session using the http session replication mechanism?

I have been using session replication successfully in JBoss EAP 6.1 in Windows. But then I changed to JBoss EAP 6.4 for dev testing in ubuntu and the same code stopped working.

There's not much to it, I just added the <distributable/> tag and didn't added any manual serialVersionUID value to the serialized class Logged.java (it stays annotated to ignore the warnings).

I store the instance of the class in the http session, shutdown the server using jboss-cli.sh --connect command=:shutdown (NOPAUSE=true environment variable), then startup the server again. After server is started, when I try to access the session again I cannot retrieve the class instance and the following error occurs in the console:

...

21:47:13,852 WARN  [org.jboss.as.clustering.web.infinispan] (http-/0.0.0.0:80-1)
 JBAS010322: Failed to load session 9OQtRW3Vgc-uf8w3DmRHD+PK: java.lang.RuntimeE
xception: JBAS010333: Failed to load session attributes for session: 9OQtRW3Vgc-
uf8w3DmRHD+PK
        at org.jboss.as.clustering.web.infinispan.DistributedCacheManager$2.invo
ke(DistributedCacheManager.java:229)
        at org.jboss.as.clustering.web.infinispan.DistributedCacheManager$2.invoke(DistributedCacheManager.java:212)
        at org.jboss.as.clustering.infinispan.invoker.SimpleCacheInvoker.invoke(SimpleCacheInvoker.java:34)
        at org.jboss.as.clustering.infinispan.invoker.BatchCacheInvoker.invoke(BatchCacheInvoker.java:48)
        at org.jboss.as.clustering.infinispan.invoker.RetryingCacheInvoker.invoke(RetryingCacheInvoker.java:85)
        at org.jboss.as.clustering.web.infinispan.DistributedCacheManager$ForceSynchronousCacheInvoker.invoke(DistributedCacheManager.java:550)
        at org.jboss.as.clustering.web.infinispan.DistributedCacheManager.getData(DistributedCacheManager.java:238)
        at org.jboss.as.clustering.web.infinispan.DistributedCacheManager.getSessionData(DistributedCacheManager.java:196)
        at org.jboss.as.web.session.DistributableSessionManager.loadSession(DistributableSessionManager.java:1429) [jboss-as-web-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
        at org.jboss.as.web.session.DistributableSessionManager.findSession(DistributableSessionManager.java:688) [jboss-as-web-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
 at org.jboss.as.web.session.DistributableSessionManager.findSession(DistributableSessionManager.java:84) [jboss-as-web-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
        at org.apache.catalina.connector.Request.doGetSession(Request.java:2661) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
        at org.apache.catalina.connector.Request.getSession(Request.java:2382) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
        at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:791) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
        at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:801) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
        at org.webstories.core.auth.AuthSession.from(AuthSession.java:12) [classes:]
...

I have no idea where to start looking into because I have no knowledge of JBoss internals, except for what is widely documented throughout the web. In this case what is documented is that you just need to add <distributable/> into the web.xml and then session replication will "magically" start working. Of course, you need to declare a class instance as serializable to be able to be serialized, but besides that I see no reason for why it is not working in JBoss EAP 6.4 in Ubuntu.

lsb_release -a:

No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 14.04.2 LTS
Release:        14.04
Codename:       trusty

java -version:

java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) Client VM (build 25.45-b02, mixed mode)