iOS microphone track publishes but sends zero audio samples

[kirat2997]

Environment:

• @livekit/react-native: 2.11.0
• @livekit/react-native-webrtc: 144.1.0
• livekit-client: 2.19.0
• WebRTC-SDK pod: 144.7559.04
• React Native: 0.81.4
• Expo: 54
• Physical iPhone
• Android works correctly

Setup:

• AppDelegate calls LivekitReactNative.setup() before React Native init.
• index.js calls registerGlobals().
• iOS does not manually call AudioSession.stopAudioSession(), configureAudio(), startAudioSession(), selectAudioOutput(), or setAppleAudioConfiguration() before publishing.
• Room connects successfully.

Symptom:
The local microphone publication appears successful:

• source: microphone
• muted: false
• mediaStreamTrack.enabled: true
• mediaStreamTrack.readyState: live
• track SID exists

But WebRTC stats stay at zero forever while speaking:

• media-source.audioLevel: 0
• media-source.totalAudioEnergy: 0
• media-source.totalSamplesDuration: 0
• outbound-rtp.packetsSent: 0
• outbound-rtp.bytesSent: 0

Question:
What can cause an iOS local audio track to be live and published, but the media-source stats to show zero captured samples? Is there a recommended native log or recovery path for the AVAudioEngine audio device module?