If removalTimeout < idleTimeout then the @PreDestroy callback is not called such as:
@org.jboss.ejb3.annotation.CacheConfig(maxSize=1,idleTimeoutSeconds=5,removalTimeoutSeconds=1)

If the removalTimeout > idleTimeout, then it functions as expected:
INFO [STDOUT] helloWorld-ejb.jar - PostConstruct
INFO [STDOUT] helloWorld-ejb.jar - Passivate
INFO [STDOUT] helloWorld-ejb.jar - Activate
INFO [STDOUT] helloWorld-ejb.jar - Destroy

When removalTimeout < idleTimeout, if the RemovalTimeoutTask finds the removalTimeout has been reached for a particular SFSB, then it should go from Activated state to PreDestory to non-existent.