2021 Regular Double Date Dime - Reverse Dot

Just finished up 2 mint sealed dime boxes intended for circulation, all being untouched solid date rolls of the 1921-2021 double date variety with the usual bluenose on the reverse, just wanted to show an interesting find.

Out of a total of 5,000 dimes thoroughly searched I managed to pull 3 with this dot on the reverse so I'm sure there are more out there, oddly similar to the shape and size of the dot that has been found on the 1964 small cent, photos are just quick snaps of one of them in a protective sleeve until my 2x2's arrive, any scratches you may see are not on the coin itself.