Ever since Michael Freeman gave a degree of "validation" to this sort of flaw by recording the 1897 Dot as F147, more and more examples have been found.
The following is an excerpt from the page on Dot pennies on my rarest pennies site.
https://rarestpennies.wordpress.com/scarce-dot-pennies/
There are many examples of pennies with small raised circular “dots” on either the obverse or reverse, now thought to be caused by a rust spot on a working die which eventually is removed by successive strikes leaving an incuse area which produces the raised flaw when creating the coin (see my article in Coin News June 2022 quoting Paul Holland's investigations into the cause).