Going to guess that is for multipulse ignition, for ultra lean operation, so you will have enough spark to ignite the fuel mix, even if the plug area is transiently non combustible, you have enough high energy sparks that the lean mix will strike before TDC and complete combustion to a large degree.
I helped my father install high energy inductive ignition, that used a vane that blocked an optical sensor, that then triggered a low resistance (IIRC under 0,8R primary) coil, to provide the ignition pulse. Had to use inductive wound Bougicord leads, as the carbon ones basically melted, and spark plugs had to be special Lodge ones, as the other brands like NGK or Champion would only last a week before misfiring. But was able to run really lean, and provide extra power at the top end of the RPM, even if your 10 000km service was change 4 spark plugs, rotor and distributor cap, as they would all be badly eroded, and not likely to make another service.
Big difference, made it a stealth supercar, well capable of beating the common sports models, 3 series BMW, low end Porsche, VW 1st generation GTI. None of them thought an Alfasud 1.5l was capable of beating them stop to stop, or at top end. He kept the stock exhaust as well, so it did not sound any different. Just used to eat gearbox synchros, and brake disks.