System.AggregateException: A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread. ---> MongoDB.Driver.MongoConnectionException: An exception occurred while receiving a message from the server. ---> System.IO.IOException: Unable to read data from the transport connection: An established connection was aborted by the software in your host machine. ---> System.Net.Sockets.SocketException: An established connection was aborted by the software in your host machine
   at System.Net.Sockets.Socket.EndReceive(IAsyncResult asyncResult)
   at System.Net.Sockets.NetworkStream.EndRead(IAsyncResult asyncResult)

public static class Program {
public static async Task Main() {
   TaskScheduler.UnobservedTaskException += TaskScheduler_UnobservedTaskException;
   var mongoClient = new MongoClient("mongodb+srv://username:password@instance.mongodb.net/Database");
   var database = mongoClient.GetDatabase("Database");
   var collection = database.GetCollection<object>("Collection");
   var count = await collection.CountDocumentsAsync(f => true);
   Console.WriteLine($"Document count: {count}");
   
   Console.WriteLine("Stop server or disconnect from the internet now");
   Debugger.Break();
   
   try {
      var count2 = await collection.CountDocumentsAsync(f => true);
      Console.WriteLine($"Document count: {count2}");
   } catch {
      // Do nothing, this is expected to fail
   }
   Console.ReadLine();
}

private static void TaskScheduler_UnobservedTaskException(object sender, UnobservedTaskExceptionEventArgs e) {
   // This should never be called, but it is
   Console.WriteLine($"UnobservedTaskException: {sender.GetType()}\n{e.Exception}");
}
}