People on the PSA set registry have known this for years. It's one of the toughest cards to get anywhere close to a 9/10 on. All kinds of manufacturer created issues with this specific card.
Looks like PSA has a bunch of 9s. No telling how many are sheet cut. 28 PSA 9 Mints and zero 10s on the Pop Report out of 2700 graded. Images of many of them below along with their sale price.
https://www.psacard.com/auctionprice.../values/193525
Think how much the first 10 would go for...