lots of Japanese knives have holes in the edge in front of the heel, especially ones that are sharpened on a wheel. rarely have i seen one that was caused by what you're describing, though it is, for sure, something i've seen, and it's fairly obvious when it is. 99/100 what is pictured is fixed the first time the knife is sharpened. since every knife i own is going to be thinned repeatedly over its life, and very often immediately, i'm not even sure i'm all that worried about over grinds on the side, unless they are really atrocious.