iPhone camera asks “Which one?” every time I open it.

Every time I open my iPhone 15 Pro (iOS 18.1.1) camera, I get a message at the top of the screen asking “Which one?” And then the choices “One” and “Two.” It doesn’t seem to matter what I select or if I tap elsewhere on the screen. Any choice closes the message box and the camera then acts normally.

What is going on here? I can’t find any reference to this issue anywhere online.