Shelling problem

There is a problem in the shell (the upper face) in point (A): up to 0.1 works; over 0.1 determines a defect.
Give it a look.
Shell problem in the point A.3dm (134.9 KB)

Thanks. But, and this is just a guess, but I’d guess that the case where one face makes two holes is probably not the thing that gets tuned first in shelling!