Handlebars Not working - Githubissues

The variable are not been replace on the email, but are working fine on the test data, I'm with JSON

{
  "nickname": "Nick Name RESFull_Email",
  "asunto": "Mi super asunto",
  "variable": "Mi Variable",
  "from": {
    "email": "<<pcFromEmail>>",
    "name": "<<pcFromName>>"
  },
  "reply_to": {
    "email": "<<pcReplyTo>>",
    "name": "<<pcRepyName>>"
  },
  "content": [
    {
      "type": "text/html",
      "value": "Prueba body"
    }
  ],

  "personalizations": [
    {
      "to": [
        {
          "email": "<<pcToEmail>>"
        },
        {
          "email": "someevam@gmail.com"
        }
      ],
      "subject": "<<pcSubject>>"

    }
  ],
  "attachments": [
    {
      "content": "<<lcFileRead64>>",
      "type": "<<pcContenType>>",
      "filename": "<<pcAttachmentFileName>>",
      "disposition": "attachment"
    }
  ],
  "template_id": "d-xxxxxxxxxxxxxxxxxxxxxxxxxxx"
}


I had try using {{var}}, %var% 
Using version 3 of the API, any help will be appreciate

In HTML Code
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html data-editor-version="2" class="sg-campaigns" xmlns="http://www.w3.org/1999/xhtml">
    <head>
      <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
      <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1">
      <!--[if !mso]><!-->
      <meta http-equiv="X-UA-Compatible" content="IE=Edge">
      <!--<![endif]-->
      <!--[if (gte mso 9)|(IE)]>
      <xml>
        <o:OfficeDocumentSettings>
          <o:AllowPNG/>
          <o:PixelsPerInch>96</o:PixelsPerInch>
        </o:OfficeDocumentSettings>
      </xml>
      <![endif]-->
      <!--[if (gte mso 9)|(IE)]>
  <style type= of the a"text/css">
    body {width: 600px;margin: 0 auto;}
    table {border-collapse: collapse;}
    table, td {mso-table-lspace: 0pt;mso-table-rspace: 0pt;}
    img {-ms-interpolation-mode: bicubic;}
  </style>
<![endif]-->
      <style type="text/css">
    body, p, div {
      font-family: arial,helvetica,sans-serif;
      font-size: 14px;
    }
    body {
      color: #000000;
    }
    body a {
      color: #1188E6;
      text-decoration: none;
    }
    p { margin: 0; padding: 0; }
    table.wrapper {
      width:100% !important;
      table-layout: fixed;
      -webkit-font-smoothing: antialiased;
      -webkit-text-size-adjust: 100%;
      -moz-text-size-adjust: 100%;
      -ms-text-size-adjust: 100%;
    }
    img.max-width {
      max-width: 100% !important;
    }
    .column.of-2 {
      width: 50%;
    }
    .column.of-3 {
      width: 33.333%;
    }
    .column.of-4 {
      width: 25%;
    }
    @media screen and (max-width:480px) {
      .preheader .rightColumnContent,
      .footer .rightColumnContent {
        text-align: left !important;
      }
      .preheader .rightColumnContent div,
      .preheader .rightColumnContent span,
      .footer .rightColumnContent div,
      .footer .rightColumnContent span {
        text-align: left !important;
      }
      .preheader .rightColumnContent,
      .preheader .leftColumnContent {
        font-size: 80% !important;
        padding: 5px 0;
      }
      table.wrapper-mobile {
        width: 100% !important;
        table-layout: fixed;
      }
      img.max-width {
        height: auto !important;
        max-width: 100% !important;
      }
      a.bulletproof-button {
        display: block !important;
        width: auto !important;
        font-size: 80%;
        padding-left: 0 !important;
        padding-right: 0 !important;
      }
      .columns {
        width: 100% !important;
      }
      .column {
        display: block !important;
        width: 100% !important;
        padding-left: 0 !important;
        padding-right: 0 !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
      .social-icon-column {
        display: inline-block !important;
      }
    }
  </style>
      <!--user entered Head Start--><!--End Head user entered-->
    </head>
    <body>
      <center class="wrapper" data-link-color="#1188E6" data-body-style="font-size:14px; font-family:arial,helvetica,sans-serif; color:#000000; background-color:#FFFFFF;">
        <div class="webkit">
          <table cellpadding="0" cellspacing="0" border="0" width="100%" class="wrapper" bgcolor="#FFFFFF">
            <tr>
              <td valign="top" bgcolor="#FFFFFF" width="100%">
                <table width="100%" role="content-container" class="outer" align="center" cellpadding="0" cellspacing="0" border="0">
                  <tr>
                    <td width="100%">
                      <table width="100%" cellpadding="0" cellspacing="0" border="0">
                        <tr>
                          <td>
                            <!--[if mso]>
    <center>
    <table><tr><td width="600">
  <![endif]-->
                                    <table width="100%" cellpadding="0" cellspacing="0" border="0" style="width:100%; max-width:600px;" align="center">
                                      <tr>
                                        <td role="modules-container" style="padding:0px 0px 0px 0px; color:#000000; text-align:left;" bgcolor="#FFFFFF" width="100%" align="left"><table class="module preheader preheader-hide" role="module" data-type="preheader" border="0" cellpadding="0" cellspacing="0" width="100%" style="display: none !important; mso-hide: all; visibility: hidden; opacity: 0; color: transparent; height: 0; width: 0;">
    <tr>
      <td role="module-content">
        <p>PRODUCTOS QUIMICOS REPRESENTACIONES, SOCIEDAD ANONIMA</p>
      </td>
    </tr>
  </table><table class="module" role="module" data-type="text" border="0" cellpadding="0" cellspacing="0" width="100%" style="table-layout: fixed;" data-muid="84b34b4b-37ca-4a2c-8cba-bf23316eced7" data-mc-module-version="2019-10-22">
    <tbody>
      <tr>
        <td style="padding:18px 0px 18px 0px; line-height:22px; text-align:inherit;" height="100%" valign="top" bgcolor="" role="module-content"><div><div style="font-family: inherit; text-align: inherit"><strong>Factura electronica: PRODUCTOS QUIMICOS REPRESENTACIONES, SOCIEDAD ANONIMA %asunto% </strong></div><div></div></div></td>
      </tr>
    </tbody>
  </table><table class="module" role="module" data-type="text" border="0" cellpadding="0" cellspacing="0" width="100%" style="table-layout: fixed;" data-muid="fa66d58d-29b4-4270-8c10-8a226defd973" data-mc-module-version="2019-10-22">
    <tbody>
      <tr>
        <td style="padding:18px 0px 18px 0px; line-height:22px; text-align:inherit;" height="100%" valign="top" bgcolor="" role="module-content"><div><div style="font-family: inherit; text-align: inherit">Estimado cliente: {{Cliente}}<br>
Adjunto le enviamos un PDF del DOCUMENTO TRIBUTARIO ELECTRONICO FEL en referencia %variable%</div>
<div style="font-family: inherit; text-align: inherit"><br></div>
<div style="font-family: inherit; text-align: inherit">Esto es una variable {{variable}}</div><div></div></div></td>
      </tr>
    </tbody>
  </table><table class="module" role="module" data-type="text" border="0" cellpadding="0" cellspacing="0" width="100%" style="table-layout: fixed;" data-muid="6f598c48-e014-453c-9ce4-9e55dc128b96" data-mc-module-version="2019-10-22">
    <tbody>
      <tr>
        <td style="padding:18px 0px 18px 0px; line-height:22px; text-align:inherit;" height="100%" valign="top" bgcolor="" role="module-content"><div><div style="font-family: inherit; text-align: inherit">Gracias</div>
<div style="font-family: inherit; text-align: inherit">Este correo es generado automaticamente por nuestro sistema, despues de la autorizacion de la SAT!...</div><div></div></div></td>
      </tr>
    </tbody>
  </table><div data-role="module-unsubscribe" class="module" role="module" data-type="unsubscribe" style="color:#444444; font-size:12px; line-height:20px; padding:16px 16px 16px 16px; text-align:Center;" data-muid="4e838cf3-9892-4a6d-94d6-170e474d21e5"><div class="Unsubscribe--addressLine"></div><p style="font-size:12px; line-height:20px;"><a target="_blank" class="Unsubscribe--unsubscribeLink zzzzzzz" href="{{{unsubscribe}}}" style="">Unsubscribe</a> - <a href="{{{unsubscribe_preferences}}}" target="_blank" class="Unsubscribe--unsubscribePreferences" style="">Unsubscribe Preferences</a></p></div></td>
                                      </tr>
                                    </table>
                                    <!--[if mso]>
                                  </td>
                                </tr>
                              </table>
                            </center>
                            <![endif]-->
                          </td>
                        </tr>
                      </table>
                    </td>
                  </tr>
                </table>
              </td>
            </tr>
          </table>
        </div>
      </center>
    </body>
  </html>

sendgrid / email-templates

Handlebars Not working #87