java.lang.IllegalStateException: Impossible VariableListener corruption: the expectedWorkingScore (0hard/-397050soft) is not the workingScore  (-2000000000hard/-397050soft) after all VariableListeners were triggered without changes to the genuine variables.
But all the shadow variable values are still the same, so this is impossible.

	at org.optaplanner.core.impl.score.director.AbstractScoreDirector.assertShadowVariablesAreNotStale(AbstractScoreDirector.java:488)
	at org.optaplanner.core.impl.solver.scope.DefaultSolverScope.assertShadowVariablesAreNotStale(DefaultSolverScope.java:140)
	at org.optaplanner.core.impl.phase.scope.AbstractPhaseScope.assertShadowVariablesAreNotStale(AbstractPhaseScope.java:171)
	at org.optaplanner.core.impl.phase.AbstractPhase.predictWorkingStepScore(AbstractPhase.java:169)
	at org.optaplanner.core.impl.localsearch.DefaultLocalSearchPhase.doStep(DefaultLocalSearchPhase.java:102)
	at org.optaplanner.core.impl.localsearch.DefaultLocalSearchPhase.solve(DefaultLocalSearchPhase.java:92)
	at org.optaplanner.core.impl.solver.AbstractSolver.runPhases(AbstractSolver.java:87)
	at org.optaplanner.core.impl.solver.DefaultSolver.solve(DefaultSolver.java:160)
	at org.optaplanner.examples.common.app.SolverPerformanceTest.runSpeedTest(SolverPerformanceTest.java:65)
	at org.optaplanner.examples.coachshuttlegathering.app.CoachShuttleGatheringPerformanceTest.solveDemo01FastAssert(CoachShuttleGatheringPerformanceTest.java:52)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:298)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:292)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.lang.Thread.run(Thread.java:745)