In iOS 13 Developer Beta 2, when you log in to the camera's own camera application, you hear a snap sound from the rear camera. Also in the application video, slow motion, portrait, etc. You can also hear the same sound when switching between shooting modes. When I turn on the camera part to share a story on Instagram again, I hear the same sound when switching between the front camera and the rear camera 4-5 times in a row. Especially when I bring the rear camera closer to my ear, I can hear the "snap" sound more clearly.
Device: iPhone 8 Plus