Nested Panel preview - unexpected Edit button

[novikov82]

{
 "title": {
  "default": "Theme's Survey",
  "es": "Encuesta temática"
 },
 "logoPosition": "right",
 "pages": [
  {
   "name": "page1",
   "elements": [
    {
     "type": "paneldynamic",
     "name": "question24",
     "minWidth": "0px",
     "title": {
      "default": "Please, help us improve our product.",
      "es": "Por favor, ayúdanos a mejorar nuestro producto."
     },
     "templateElements": [
      {
       "type": "panel",
       "name": "panel1",
       "elements": [
        {
         "type": "text",
         "name": "question20",
         "minWidth": "0px",
         "title": {
          "default": "E-mail",
          "es": "Correo electrónico"
         },
         "defaultValue": "brooklyn.simmons@example.com"
        }
       ],
       "title": {
        "default": "Send us your contact information (optionally).",
        "es": "Envíenos su información de contacto (opcionalmente)."
       },
       "minWidth": "0px"
      }
     ],
     "panelCount": 1,
     "minPanelCount": 1,
     "panelAddText": {
      "default": "Add New",
      "es": "Agregar nuevo"
     },
     "renderMode": "progressTop"
    }
   ],
   "title": {
    "default": "Form Library in Action",
    "es": "Biblioteca de formularios en acción"
   },
   "description": {
    "default": "Form Library is extensible and allows you to change its behavior as your needs require. Take advantage of more than a hundred free demos showing functionality that includes all popular scenarios.",
    "es": "La biblioteca de formularios es extensible y le permite cambiar su comportamiento según lo requieran sus necesidades. Aproveche las más de cien demostraciones gratuitas que muestran la funcionalidad que incluye todos los escenarios populares."
   }
  }
 ],
 "showTitle": false,
 "showQuestionNumbers": "off",
 "maxOthersLength": 256,
 "showPreviewBeforeComplete": "showAllQuestions",
 "widthMode": "static",
 "width": "904"
}