RETE-OO: Reversed live query results order compared to PHREAK

Description of problem:

Live queries return results in different order with PHREAK and with RETE.

For instance, imagine you define a live query (KieSession.openLiveQuery()) which returns two rows, A and B. If you attach a ViewChangedEventListener to the query, the ViewChangedEventListener.rowInserted(Row) method gets called as follows:

PHREAK:
ViewChangedEventListener.rowInserted(A),
ViewChangedEventListener.rowInserted(B)

RETEOO:
ViewChangedEventListener.rowInserted(B),
ViewChangedEventListener.rowInserted(A)

I am not sure if this is by design or a bug, or just the order of query results is not guaranteed in general.

Could someone from engineering comment this?

Version-Release number of selected component (if applicable):

Drools 6.0.0-SNAPSHOT
BRMS 6.0.0 ER4

How reproducible:

Run LiveQueriesTest from the attached Maven project with setting drools engine to RETE:

mvn clean test -Dtest=LiveQueriesTest -Ddrools.ruleEngine=reteoo

The query results order is reversed when executed with PHREAK:

mvn clean test -Dtest=LiveQueriesTest -Ddrools.ruleEngine=phreak