tkobayas commented on PR #6430:
URL: 
https://github.com/apache/incubator-kie-drools/pull/6430#issuecomment-3247935383

   Thoughts:
   
   Eval is not property reactive aware, so 
https://github.com/apache/incubator-kie-drools/commit/e134ac6c92a529d38784e2db04016c6a0dee98b2
 was introduced to disable property reactivity of the previous JoinNode.
   
   Then, what happens if it's not Eval?
   
   for example)
   ```
   rule "b_1"
       when
           dt1 : Dt1( )
           dt2 : Dt2( )
           dt3 : Dt3( dt2.t == "YES")
   ```
   
   In this case, `PatternBuilder.lookAheadFieldsOfIdentifier` searches all 
patterns in LHS and find `dt2.t` is evaluated, adds the field `t` to 
`listenedProperties`. So `Dt2( )` JoinNode is property reactive on `t` 
modification!


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