No marks on the seat tube but I do have a couple on the top of the fork. Also have a few on the inside of the chain stays. I have nearly 5,000 miles on the Mog now, I’d be shocked if I didn’t have any marks on the bike by now.
Maybe I got unlucky with my Thunderburt, its only the rear that has had any issues. Maybe I will remount them in the future and swap front to the back to see if I still get punctures.