Android ConnectivityManager onAvailable sometime not returned

I use ConnectivityManager to listen internet connection change inside app like this.

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        ...
        ConnectionStateMonitor().enable(this)
    }

    class ConnectionStateMonitor : NetworkCallback() {
        private val networkRequest: NetworkRequest = NetworkRequest.Builder()
            .addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)
            .addTransportType(NetworkCapabilities.TRANSPORT_WIFI).build()

        fun enable(context: Context) {
            val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
            connectivityManager.registerNetworkCallback(networkRequest, this)
        }

        override fun onAvailable(network: Network) {
            Log.i(TAG, "onAvailable ")
        }

        override fun onLost(network: Network?) {
            super.onLost(network)
            Log.i(TAG, "onLost ")
        }
    }
}

It working good except some problem

• If we connect to internet by both wifi and mobile data, when we turn off wifi then sometime onLost fired -> onAvailable fired (CORRECT) and sometime only onLost fired (WRONG)

• Also, there is another problem: If we don't have internet connection -> open app -> onLost() not fired. However, if we have internet connection -> open app -> onAvailable fired

Any help, suggestion, workaround or another approach to detect internet connection change would be great appreciate.

Tested on Xioami A2 (Android 9), OnePlus (Android 9)

DEMO project
https://github.com/PhanVanLinh/AndroidNetworkChangeReceiver

from Android ConnectivityManager onAvailable sometime not returned