The issue was addressed with additional restrictions on the observability of app states. This issue is fixed in macOS Big Sur 11.7, macOS Ventura 13, iOS 16, watchOS 9, macOS Monterey 12.6, tvOS 16. A sandboxed app may be able to determine which app is currently using the camera.
https://support.apple.com/en-us/HT213486
https://support.apple.com/en-us/HT213443
https://support.apple.com/en-us/HT213488
https://support.apple.com/en-us/HT213487