You are right, I wrote 127 and I meant 110. I was surprises those new 110 rolls were pre-flashed with frame boundaries. I actually would be surprised just the same for any format.
All 110 film, even the old rolls, were pre-flashed. I believe it has to do with the cheap meniscus lenses in most 110 cameras. Since the lenses were low-quality, you had a distinct loss of sharpness in the corners; so much that people in tests complained. Instead of using better quality lenses, Kodak put frame boundaries in in order to prevent photofinishers from using the softer edges of the image.
"Panic not my child, the Great Yellow Father has your hand"--Larry Dressler