I have been carrying the bag 5 days a week for about 5 weeks. Haven't had problems with edgepaint to this degree before so didn't know what the best course of action is.
If not overheated, it must be faulty edge paint. Or faulty application. Maybe there is supposed to be a thin adhesive coating under the edge paint that they forgot to apply?
As you clearly love your bag, (I adore my Hera in the same China Blue leather

) I would ask Marco to let you return it and have the edge paint redone all over. If you ask him to merely send you some edge paint, I suspect the new edge paint would not be the exact same shade, so "patching" it would not look good. And this degreed of edge paint peeling is surely a production issue...
I have had
cracks in edge paint, mainly on non-Massaccesi bags. My impression is that the thicker the layer of edge paint, the more vulnerable it is

(I have a couple of times requested "as little/thin layer of edge paint as possible" from Marco, simply because I do not find thick layers of edge paint attractive. The thin layer of edge paint is almost invisible, looks almost like part of the leather. Have never experienced cracks in thin edge paint. Needless to say, I never request contrasting edge paint

It has always puzzled my why many luxury brands use black or dark brown edge paint regardless of the colour of leather)
Best wishes to you and your lovely bag
