My 2 cents worth: I almost always use a vice with my mill. The only
time I have used the actual top surface to hold material is when I have
worked on some large 1/4 inch tooling plates. In all cases, an oops
like you describe would not matter.

I have used JB WELD to repair a cast steel vice that had a bunch of
drilling oops in it. None were where pressure was applied and was used
for cosmetic appearances.

My suggestion is to ignore the problem unless the sight of it bothers
you.

Paul