I also recall hearing something about this issue on multi-volt ballasts back in the early 1990’s, but I never was able to confirm it myself.
I do seem to remember that some older Grasslin DT series multi-volt defrost timers I installed on walk-in freezers had what they called automatic voltage adjustment. They would work on 120/208/240. You just hooked them up and they would “burn in” at whatever supply voltage they were connected to.
They must have done away with that feature, because the last ones I saw had the little DIP switches on the board that you manually set for the required voltage.
