Rules using 'from window length' refire incorrectly after session deserialization.

Full story on usage forum.
https://groups.google.com/forum/#!topic/drools-usage/kTHTVXZznxw

In summary...
Insert facts Event#1, Event#2, Event#3 into a stateful, psuedo clock stream session with...

declare window lastEvent
Event() over window:length(1)
end

rule "Reporting Last Event 1001"
when
$e : Event($eventCode : eventCode == "1001") from window lastEvent
then
log.info("Reporting Last Event 1001 : " + $e);
end

The rule "Reporting Last Event" will refire after deserialization from disk for Events #1+#2

Demonstrated with the attached reproducer window-demo. Run the JUnit test to get this console output...

INFO 17:25:40 [org.kev.KnowledgeSession] creating kcontainer
INFO 17:25:40 [org.drools.compiler.kie.builder.impl.ClasspathKieProject] Found kmodule: file:/C:/Users/Kevin/workspace_luna/window-demo/target/classes/META-INF/kmodule.xml
INFO 17:25:40 [org.drools.compiler.kie.builder.impl.KieRepositoryImpl] KieModule was added: FileKieModule[releaseId=org.kev:window-demo:0.0.1-SNAPSHOT,file=C:\Users\Kevin\workspace_luna\window-demo\target\classes]
INFO 17:25:42 [org.kev.KnowledgeSession] no messages from kContainer
INFO 17:25:42 [org.kev.KnowledgeSession] KieSession sessionDefault is OK INSERTING Event OBJECTS CAUSES RULES TO FIRE NICELY....
INFO 17:25:42 [org.kev.KnowledgeSession] Reporting Last Event 1001 : Event [eventCode=1001, recordedTime=13-10-15 17:25:39.904]
INFO 17:25:42 [org.kev.KnowledgeSession] Event Insert : Event [eventCode=1001, recordedTime=13-10-15 17:25:39.904]
INFO 17:25:42 [org.kev.KnowledgeSession] Rules Fired : 2
INFO 17:25:42 [org.kev.KnowledgeSession] Reporting Last Event 1001 : Event [eventCode=1001, recordedTime=13-10-15 17:25:40.904]
INFO 17:25:42 [org.kev.KnowledgeSession] Event Insert : Event [eventCode=1001, recordedTime=13-10-15 17:25:40.904]
INFO 17:25:42 [org.kev.KnowledgeSession] Rules Fired : 2
INFO 17:25:42 [org.kev.KnowledgeSession] Reporting Last Event 1001 : Event [eventCode=1001, recordedTime=13-10-15 17:25:41.904]
INFO 17:25:42 [org.kev.KnowledgeSession] Event Insert : Event [eventCode=1001, recordedTime=13-10-15 17:25:41.904]
INFO 17:25:42 [org.kev.KnowledgeSession] Rules Fired : 2
INFO 17:25:42 [org.kev.ReplayTests] Fire All Rules Before Save............ NO MESSAGES HERE. SHOWS NO OUTSTANDING RULES TO FIRE IN SESSION.
INFO 17:25:42 [org.kev.ReplayTests] Saving Session............ NOW WE SAVE TO DISK
INFO 17:25:42 [org.kev.KnowledgeSession] Marshalling ksession to disk : C:\Users\Kevin\workspace_luna\window-demo\demo.ks
INFO 17:25:43 [org.kev.ReplayTests] Restoring Session............ AND HERE'S THE RESTORE OF A NEW SESSION FROM DISK
INFO 17:25:43 [org.kev.KnowledgeSession] no messages from kContainer
INFO 17:25:43 [org.kev.KnowledgeSession] KieSession sessionDefault is OK
INFO 17:25:43 [org.kev.KnowledgeSession] Marshall ksession from disk : C:\Users\Kevin\workspace_luna\window-demo\demo.ks
INFO 17:25:43 [org.kev.KnowledgeSession] pseudoClock is recovered to :13-10-15 17:25:41.904 ...ALL GOOD SO FAR, BUT NOW I FIRE ALL RULES
INFO 17:25:43 [org.kev.ReplayTests] Fire All Rules After Restore (1)............THESE NEXT MESSAGES ARE UNEXPECTED. IT'S THE FIRST 2 EVENTS THAT I'D ORIGINALLY INSERTED. But, nothing has been inserted since the restore.
INFO 17:25:43 [org.kev.KnowledgeSession] Reporting Last Event 1001 : Event [eventCode=1001, recordedTime=13-10-15 17:25:39.904]
INFO 17:25:43 [org.kev.KnowledgeSession] Reporting Last Event 1001 : Event [eventCode=1001, recordedTime=13-10-15 17:25:40.904]
INFO 17:25:43 [org.kev.ReplayTests] Fire All Rules After Restore (2)............ANOTHER FIRE ALL RULES AND NORMAL BEHAVIOUR RETURNS

Consequence is that RHS fires unexpectedly for facts that have already been handled before serialization.

KP