Boruto's eye scar

Karma is touted to have one of the greatest healing powers. Which maybe even greater than Hashirama Senju's healing prowess. We know that Isshiki had completely broken Boruto's body. But it totally healed as soon as Momoshiki took over. We also know that strong healing powers don't leave a scar when the wound is healed.

But time skip Boruto's eye scar is fishy. The scar mark is still there and his Karma pattern doesn't spread over the scar mark.

An argument can be made that Kakashi still has his scar mark. But Kakashi didn't have any healing powers and facial scars on normal people don't fade that easily. But anybody with a strong healing power like Naruto or Boruto shouldn't have any scars.