The back camera on my iPhone 13 Pro Max is making a buzzing sound

That would indicate a hardware problem with your iPhone. Schedule an appointment at your Apple Store Genius Bar for evaluation and service options --> Genius Bar Reservation and Apple Support Options - Apple

Hello~ Yes…that would definitely fall under a hardware issue. Do as * lobsterghost1* suggests and make an appointment to have your iPhone repaired.

~Katana-San~

Uh, you damaged your phone and you're asking if that could be an issue? You damaged your phone. It needs to either be fixed or replaced.