Rule update - java.lang.ClassCastException: org.drools.reteoo.WindowTupleList cannot be cast to org.drools.common.InternalFactHandle

The following exception occurs if a rule containing a sliding time window pattern was retracted and asserted / updated again (see attached example).
This is a common scenario in our AAL system, where users repeatedly generate and update rules (via a web GUI).

java.lang.ClassCastException: org.drools.reteoo.WindowTupleList cannot be cast to org.drools.common.InternalFactHandle
at org.drools.reteoo.WindowNode.updateSink(WindowNode.java:301)
at org.drools.reteoo.BetaNode.attach(BetaNode.java:408)
at org.drools.reteoo.builder.BuildUtils.attachNode(BuildUtils.java:145)
at org.drools.reteoo.builder.GroupElementBuilder$NotBuilder.build(GroupElementBuilder.java:261)
at org.drools.reteoo.builder.GroupElementBuilder.build(GroupElementBuilder.java:70)
at org.drools.reteoo.builder.GroupElementBuilder$AndBuilder.build(GroupElementBuilder.java:112)
at org.drools.reteoo.builder.GroupElementBuilder.build(GroupElementBuilder.java:70)
at org.drools.reteoo.builder.ReteooRuleBuilder.addSubRule(ReteooRuleBuilder.java:161)
at org.drools.reteoo.builder.ReteooRuleBuilder.addRule(ReteooRuleBuilder.java:134)
at org.drools.reteoo.ReteooBuilder.addRule(ReteooBuilder.java:113)
at org.drools.reteoo.ReteooRuleBase.addRule(ReteooRuleBase.java:445)
at org.drools.common.AbstractRuleBase.addRule(AbstractRuleBase.java:952)
at org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:629)
at org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:472)
at org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:149)