title: problem with firestore & rtc engine in flutter
body: <p>I am having a problem with some internet connection in my app.
  The problem is that <strong>Cloud Firestore</strong> doesn't work when I add <strong>agora rtc engine</strong> to the dependencies alongside with Cloud Firestore. Everything works fine in <strong>debug mode</strong>, but in <strong>release mode</strong>, when I open my app to make a test, everything works except Google Cloud Firestore. It wont load/write any data like there is no internet connection. When I remove agora rtc engine from <strong>pubspec.yaml</strong> dependencies, Cloud Firestore works back. Any suggestions?</p>