I installed the rear rack on my Urbano and the magnets do not touch when I fold the bike. The handle bar touches the rack preventing the bike from fully closing.
A fix would be to offer an extended replacement part (the non-magnet piece) to people who bought the rack and to include the part in future purchases.
The downside to my suggestion would be the piece sticking out when riding the bike. Maybe I'll just stick some neodymium magnets there to close the gap for now.