MC15 HITS lack the information in the
/Simulation/Parameters metadata to set
digitizationFlags.TRTRangeCut correctly, so now that the default value of this flag has changed (to match the MC16/MC20/MC21 default) then it has to be set manually for these legacy configurations.
FYI @abarton could you possibly merge this one for tonight please? - as the CI will not check anything for these ART scripts.