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I asked RATP information agents at Arcueil-Cachan and Châtelet-Les Halles. They didn't even understand or acknowledge the existence of a bug. Instead they offered suggestions like "buy it at Paris" or "buy it at Blanc-Mesnil", which defeat the purpose of a complement de parcours entirely. I asked SNCF agents at Gare du Nord too, they were marginally better but offered similar suggestions. I'll try again at an RATP agence commerciale, perhaps they will have more competent staff.