That's a good point.I can’t see it slicing bread, but after 1990, the lock rings gained a cutout on the bottom that held the blade closed if you turned the ring. That notch made it possible while opening the blade to lever the ring off the knife and send it flying. The first time it happened to me, I was in my son’s back yard, and never saw the lock ring again.
The 1990 “improvement” was the answer to a question that nobody was asking; In the twenty-odd years prior to that time, I carried Opinels without ever having one open in my pocket. The answer to flying lock rings was the more recent design change that limits axial movement of the ring by a nub on the inner surface of the lockring that runs in a groove in the ferrule. It also limits locking rotation of the ring to one direction. This new setup works okay for a while, but I like to turn my lock-rings the other way, so I modify my new Opinels to permit that.
By the way, I never understand why to lock Opinels in closed position unless small childrens are involved. I could say with confidence Opinels are not self opening knives. At least all my Opinels were more on the hard side to open directly from factory.