Princess rescue example does not work in cluster

Steps to reproduce the issue:

1) start first and second JBossAS 6 instance to make a cluster (the 2 commands can be found in https://github.com/weld/core/blob/master/examples/README.md)
2) add <distributable/> flag to web.xml in the example in the profile for JBossAS
3) build the application: "mvn clean package -Pjbossas"
4) copy the resulting war to $JBOSS_HOME/server/all/farm
5) go to first browser (with disabled cookies) to http://localhost:8080/princess-rescue/
6) go through several rooms in the game
7) copy the whole URL to clipboard,
8) kill the first JBossAS instance (only the first)
9) open second browser window with cookies disabled, paste the URL there and change port number from 8080 to 8180
10) now you should see the same page as in the first browser window (except the current info message at the top which is RequestSoped), anyway the buttons should be disabled/enabled properly according to the first window which they are not

I'm attaching my screenshot with both the browsers. I cannot see any error message at JBossAS console.