Transaction with Entitiframework 6.1.3 and PostgresSql does not work correctly

I'm trying to use EntityFramework6.Npgsqlcom transaction, however I get an exception when I call the DbContext.UseTransaction method and step a transaction.

Error message (Last InnerException):

  

"Npgsql.PostgresException (0x80004005): 25P02: current transaction is aborted, commands ignored until transaction end \ r \ n in Npgsql.NpgsqlConnector.

So I created a project to simulate and try to find the real problem:

Test Project

[Route("")]
    public async Task<IHttpActionResult> Get()
    {
        try
        {
            using (var conn = new Npgsql.NpgsqlConnection(ConfigurationManager.AppSettings["app:pgconn"]))
            {
                conn.Open();
                using (var transaction = conn.BeginTransaction(System.Data.IsolationLevel.ReadUncommitted))
                {
                    using (var ctx = new CadastrosContext(conn))
                    {
                        var tenant = new Tenant();



                        ctx.Database.UseTransaction(transaction);

                        ctx.Tenants.Add(tenant);
                        await ctx.SaveChangesAsync()
                            .ConfigureAwait(false);

                        Debug.WriteLine($"Tenant 1 Id: {tenant.TenantId}");
                    }

                    using (var ctx = new CadastrosContext(conn))
                    {
                        var tenant = new Tenant();



                        ctx.Database.UseTransaction(transaction);

                        ctx.Tenants.Add(tenant);
                        await ctx.SaveChangesAsync()
                            .ConfigureAwait(false);

                        Debug.WriteLine($"Tenant 2 Id: {tenant.TenantId}");
                    }

                    await transaction.CommitAsync();
                }
            }
        }
        catch (Exception ex)
        {
            throw;
        }


        return Ok();
    }

Packages used

  

package id="EntityFramework" version="6.1.3" targetFramework="net462"   Home   package id="EntityFramework6.Npgsql" version="3.1.1" targetFramework="net462"   Home   package id="Npgsql" version="3.1.2" targetFramework="net462"

The strangest thing is that in the second method call, everything happens normally. After a few hours investigating the problem (using other databases it works normally), I found that by changing the version of EntityFramework used, the project works again.

Packages that work

  

package id="EntityFramework" version="6.1.0" targetFramework="net462"   Home   package id="EntityFramework6.Npgsql" version="3.1.1" targetFramework="net462"   Home   package id="Npgsql" version="3.1.2" targetFramework="net462"

Has anyone else had this problem ?? Is there a bug in Npgsql / EntityFramework6.Npgsql that does not support the latest version of EntityFramework (6.1.3)?