I'm also having this issue, along with the noise while charging. I reported it to Apple, but they prioritized the charging issue. If anyone has any information about the camera issue being reported, any information would be appreciated.
Initially, they asked me if the camera noise occurred only in the Camera app or also in other apps like Messenger, WhatsApp, etc. I replied that it occurs in all apps. Then, I noticed that when I was in the Camera app, there were clicks when switching cameras, but when I switched to the front camera, the constant noise disappeared. After that, they didn't ask any more questions about it.