DefaultSolver.runSolverPhases() will go through each phase, and will revert
the changes if they're not better. Or, more exactly, here are lines 191-193:

if (it.hasNext())

{ // solverScope.setWorkingSolutionFromBestSolution(); }

Now, if this involved setting the planning variables for the first time,
those will be reverted.

–
View this message in context: http://drools.46999.n3.nabble.com/Planner-Initialized-solution-local-search-tp4018594p4018642.html