Noise when recording videos on iPhone after iOS 18.6.1 update

Hello, I have a problem with the sound when recording videos. When I record in silence, I have this strange noise, as if I were underwater. If I speak at the beginning of the video, for example, there is no noise... but as soon as I don't speak at the beginning of the video or something loud is heard, I have this horrible noise. It happens to me after updating to iOS 18.6.1.

[Re-Titled by Moderator]

Original Title: Sound problem when recording video.