JSON output doesn't add the new line on my model file in ASP.NET Core MVC

I'm going to get straight to the point: my model file Vanexo3_h was missing the parameter puertoembarque, so I decided to added so I can print that in a PDF viewer on my system. The problem is that apparently the JSON doesn't shows the new parameter. I made sure that I was looking at the correct data, and I just cannot figure out why the JSON refuses to get the new parameter.

Here's Vanexo3_h:

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Runtime.Serialization;
using System.Web;

namespace WcfServiceSyspesca.Models
{
    [DataContract]
    public partial class Vanexo3_h
    {
        [Key]
        [DataMember]
        public String dm { get;set; }
        [DataMember]
        public String nro_reg { get;set; }
        [DataMember]
        public DateTime? fecha_reg { get;set; }
        [DataMember]
        public String ctnr_nber { get; set; }
        [DataMember]
        public string truck_name { get; set; }
        [DataMember]
        public Int32? truck_country { get; set; }
        [DataMember]
        public string puertozarpe { get; set; }
        [DataMember]
        public string nomnaviera { get; set; }
        [DataMember]
        public string doc_trans { get; set; }
        [DataMember]
        public Decimal cajas{ get; set; }
        [DataMember]
        public Decimal unidades_kg { get; set; }
        [DataMember]
        public Decimal peso_neto_caja { get; set; }
        [DataMember]
        public Decimal peso_brut_caja { get; set; }
        [DataMember]
        public Decimal ccl { get; set; }
        [DataMember]
        public string truck_countryname { get; set; }
        [DataMember]
        public int barcoExpID { get; set; }
        [DataMember]
        public string barcoEXP { get; set; }
        [DataMember]
        public int PaisBarcoExpID { get; set; }
        [DataMember]
        public string PaisbarcoExp { get; set; }
        [DataMember]
        public Int32? CodigoUsuarioOrigen { get; set; }
        [DataMember]
        public string nombreusuario { get; set; }
        [DataMember]
        public string puertoembarque { get; set; } /*<--THIS IS THE NEW PARAMETER*/
    }
}

And at last, here's the JSON's output:

{
    "CodigoUsuarioOrigen":16,
    "PaisBarcoExpID":128,
    "PaisbarcoExp":"LIBERIA",
    "barcoEXP":"SEAHORSE-01",
    "barcoExpID":128,
    "cajas":1445,
    "ccl":17484.74,
    "ctnr_nber":"FANU50697824",
    "dm":"3-7346",
    "doc_trans":"**************",
    "fecha_reg":"\/Date(2148945600000-0900)\/",
    "nombreusuario":"MATIAS CAMPOS",
    "nomnaviera":null,
    "nro_reg":"552365489",
    "peso_brut_caja":342.30,
    "peso_neto_caja":315.00,
    "puertozarpe":null,
    "truck_country":null,
    "truck_countryname":null,
    "truck_name":"",
    "unidades_kg":7225.0000
}

If you need more info, please let me know