Don't make us seperate You too. Didn't they back in the day call that feather/pencil; over the ear? Internal die break?
Just saying it's not PMD. First one I've seen like this - thought it was strange. Sure did bring out some interesting responses.
I just think it is part of the design that has been flattened out at some point by pressure or contact. https://www.pcgs.com/coinfacts/coin/1986-1c-rd/3124