[Python] FlightClient.DoAction raises RPC exception (C# Client <-> Python Flight Server)

Unhandled exception. System.AggregateException: One or more errors occurred. (Status(StatusCode="Unknown", Detail="a bytes-like object is required, not 'str'. Detail: Python exception: TypeError"))
 ---> Grpc.Core.RpcException: Status(StatusCode="Unknown", Detail="a bytes-like object is required, not 'str'. Detail: Python exception: TypeError")
   at Grpc.Net.Client.Internal.HttpContentClientStreamReader`2.MoveNextCore(CancellationToken cancellationToken)
   at Apache.Arrow.Flight.Internal.StreamReader`2.MoveNext(CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at Test.Program.Main(String[] args) in C:\Users\Chris\Test\Program.cs:line 33
 

using System;
using Grpc.Net.Client;
using Apache.Arrow.Flight.Client;
using Apache.Arrow.Flight;

namespace Test
{
    class Program
    {
        static void Main(string[] args)
        {
            var address = "http://localhost:5005";
            Console.WriteLine($"Connecting to: {address}");
            var channel = GrpcChannel.ForAddress(address);
            var client = new FlightClient(channel);
            var shutdownAction = client.DoAction(new FlightAction("shutdown"));                 shutdownAction.ResponseStream.MoveNext(default).Wait();
            
        }
    }
}