One column is dropped when XLSX exports.

[allgrowsm]

Hello there,

I have line graph and categoryField is date like following.

{
date_at: "2012/11/11",
a:10,
b:23
}

When I export line graph, date_at column is not included somehow.

I have following export setting.

    "export":{                                                                                                   
      "enabled": true,                                                                                           
      "fileName": "<?= date('Y/m/d').\Config::get('common.metric_name.'.str_replace("/","_",$metric))?>" ,       
      "menu": [                                                                                                  
        {                                                                                                        
          "class": "export-main",                                                                                
          "menu":[                                                                                               
            {                                                                                                    
              "label": "PDFでダウンロード",                                                                      
              "format": "PDF",                                                                                   
              "content": [{                                                                                      
                "image": "reference",                                                                            
                "fit": [ 523.28, 769.89 ] // fit image to A4                                                     
              }]                                                                                                 
            },                                                                                                   
            {                                                                                                    
              "label": "PNGでダウンロード",                                                                      
              "format":"PNG"                                                                                     
            },                                                                                                   
            {                                                                                                    
              "label": "Excelでダウンロード",                                                                    
              "format":"XLSX",                                                                                   
            },                                                                                                   
          ]                                                                                                      
        }                                                                                                        
      ]                                                                                                          
    }

I also checked using processData like following in the export.

"processData": function (data, cfg) {
 console.log(cfg);
}, 

But, the date_at value is missing.
The other a and b values are in the XLSX.
Do you have any suggetion for this?

Regards,