Weird Leo I Ae4 - Planchet Flaw Or Remnants Of Ancient Nail?

...I almost wrote "planchet flaw or PMD" but decided that it would be too silly.



Eastern Roman Empire
Leo I (457-474)
AE4 (12x10 mm), 1.29 grams
Obverse DN L/EO; not sure of the reverse

Had this coin for a few years, apparently never bothered to make a photo.

I always thought that the bit in the middle is the remnant of an ancient nail that somehow stuck through the coin many centuries ago.
Now that I think about it, though, it might also be a weird planchet flaw.
So I decided to turn to the good people of CCF for their opinion

For the record, the middle bit does attract a neodymium magnet, which is what used to be my argument in favor of the nail theory. But maybe a planchet flaw could result in that as well.