Pinholes?

I got my Florida ones in the mail today and almost immediately held a 1/2 up to a lamp to see the blue shine through haha. Then out of curiosity held a few others up… and noticed that on a lot of my Florida 1s there are tiny spots where the light shines through.

I held up some 1s from various 2023 and 2022 states that I have… and noticed a single little pinprick on one of them, but not on most. Nowhere near as many as the Florida 1s I have.

Is this a manufacturing defect? Or just “normal”? Has anybody else noticed this?