1958 Mess!

That bottom area is sitting well-up from the surface. If it's a part of the delamination that didn't peel off how do you explain why it didn't take any impression from the stalk? That bottom area was depressed when the coin was struck, that's why the stalk didn't "take" on it. It was a "negative" impression on the planchet struck by a "negative" impression on the die. Note, too, how the bottom of it is rather uniformly "ribbed," as opposed to "smooth." That's kind of odd, as well.

I don't know. Just throwing this whole error off on a delamination doesn't seem like quite the whole story, here.

The ribbing matches the ribbing underneath. The ribbing was caused by the alloy mix. Imagine a woody sliced at an angle to the flat plane.

The bent up area happened after the strike. The impression of the stalk is hidden underneath.

I do not mean to sound "matter of fact" just my best guess.

Edit: I mean I agree with Bio This is what happens when you get distracted while posting.

I think so. It looks like a rat-tailed comb. I see the impression of the stalk above it (very thinly outlined). We are saying the bent over part (the head of the comb) happened after the strike.