I searched an OBW roll of 1958-D Lincoln Cents. I found 6 coins with, I assume a die scratch, on the mintmark.
I'm not going with a crack. Possibly some tooling mark when hand punching the mint mark. @paddyman98 What say you my friend?
I think a crack would extend somewhat into Lincoln's jacket. If convex, a die scratch, if concave a strike thru. BTW, what's an antonym for incuse?