text: The border between France and Italy around the Mont Blanc is disputed.
  However, France considers the whole region around the peak to be French territory, so Italy won't touch the summit at all.
  Thus, the border line from the Mont Blanc de Courmayeur via Col Major to Mont Blanc needs to be shifted to the west.
  You can compare this to Google:
  https://www.google.com/maps/place/Mont+Blanc/@45.8306282,6.859248,16z/data=!4m5!3m4!1s0x4789459fb534be51:0xa908728c5dcec4c0!8m2!3d45.8326223!4d6.8651749!5m1!1e4
  It seems, the border to the west must also be shifted, as the Refuge Vallot is clearly in France on the Google map, whereas it is in disputed terrain in OSM. (But I am not sure about this one.)