Received trailing metadata size exceeds limit with .net core client

Users Dgraph
2 
using DgraphDotNet;
using Grpc.Core;
using Microsoft.Extensions.Configuration;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;

public class DgraphService
{
    private readonly IDgraphClient _client;

    public DgraphService(IConfiguration config)
    {
        var server = config["Dgraph:Server"];
        var channelOptions = new List<ChannelOption>
        {
            new ChannelOption(ChannelOptions.MaxSendMessageLength, 2147483647),    // ~2GB
            new ChannelOption(ChannelOptions.MaxReceiveMessageLength, 2147483647)  // ~2GB
        };
        _client = DgraphDotNet.DgraphClient.NewDgraphClient(
            new[] { new GRPCConnection(server, ChannelCredentials.Insecure, channelOptions) }
        );
    }

    public async Task<string> QueryAsync(string query, Dictionary<string, string> vars = null)
    {
        using var txn = _client.NewTxn();
        try
        {
            var request = new Request { Query = query };
            if (vars != null)
            {
                request.Vars.Add(vars);
            }
            var response = await txn.Query(request);
            return response.Json.ToStringUtf8();
        }
        catch (RpcException ex)
        {
            throw new Exception($"gRPC error: {ex.StatusCode} - {ex.Status.Detail}", ex);
        }
        finally
        {
            await txn.Discard();
        }
    }

    public async Task SetupSchemaAsync()
    {
        using var txn = _client.NewTxn();
        try
        {
            var schema = @"
                name: string @index(exact) .
            ";
            await txn.Mutate(new Mutation { SetNquads = schema });
            await txn.Commit();
        }
        finally
        {
            await txn.Discard();
        }
    }

    public async Task InsertSampleDataAsync()
    {
        using var txn = _client.NewTxn();
        try
        {
            var mutation = new Mutation
            {
                SetNquads = "_:alice <name> \"Alice\" ."
            };
            await txn.Mutate(mutation);
            await txn.Commit();
        }
        finally
        {
            await txn.Discard();
        }
    }
}