Don't have a personal experience on this, but in discussions with regulators on this subject one airline mentioned that this could be a possible reason why one particular passenger didn't receive assistance at a connecting airport.
As I recall it was outside Europe where the airlines were being slugged by the airport with very high PRM fees, even if the passenger declined it. That airline had been cancelling down-line PRM requests as a result, but promised to look into their procedures.
I have no idea what the final outcome was, but I filed that information for future reference.