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Forward porting fix from 5.6 to 6.0.x. Waiting for acks and blocker flag.
Cherry-picked into 6.0.x: https://github.com/droolsjbpm/drools/commit/9f61c3d53eb24d9421606c0bbb15d19369893547
Verified on BRMS 6.0.0 ER7.