I am facing same issue... but no update from iOS team...

We built an app in 2018 using Xamarin with AVFoundation which was working perfect but as soon as we updated iOS 15.4 in 2022, the scanning stopped working and now camera is scanning random Barcodes. After searching a-lot we could not find this issue on other forums So not sure what the issue is but there are certainly issues with iOS Scanning using AVFoundation..