Unexpected getting cloud_firestore/permission-denied in production sometimes

Question

My Firestore rule:

match /app/info {
  allow read;
}

My code:

FirebaseFirestore.instance
        .collection('app')
        .doc('info')
        .snapshots()
        .listen(
        (event) {
          final _minVersion = event.data()?['min_version'];
          if (_minVersion is! String) return;
          shouldUpdateApp(Version.parse(_minVersion), context.appLoc);
        },
        onError: (Object error, StackTrace? stackTrace) {
          FirebaseCrashlytics.instance.recordError(
            error,
            stackTrace,
            reason: 'app info onError',
          );
        },
      )

And is working perfectly in development.

However, sometimes in production I get errors reported to Firebase Crashlytics.

Non-fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError

[cloud_firestore/permission-denied] The caller does not have permission to execute the specified operation.. Error thrown app info onError.

---

Update 18 May 2022:

This only happens when the device is 100% running in background.