I have also struggled with iPhone 15 scanning Missouri lottery tickets, and it was even worse after one of the recent updates. I messed around with the camera settings randomly, and I can now scan after many months of frustration. Under settings- camera, I have all the buttons on except for the “use volume up for burst.” Under “preserve,” it takes you to a second page and I have everything on except action mode. Under photographic style I have it set to default 24mm -1x, and the buttons for 28mm and 35mm are on. I don’t know why it works now so I’m simply relaying all of the settings as of today when it started working after I changed settings.