userData in metadata is not recorded on http://coloredcoins.org/explorer/

[Nd60]

I am using Colu SDK. It is basically the sample code for "Send Asset" in the Colu Engine Documentation. I am trying to modify the user metadata and send the asset.

var Colu = require('colu');
var assetId = 'Ua4VMXDsJ9bqyRty8zoNdiLS5rWfhDia8MK1hA'
var fromAddress = '18yQggmxK4wgVDvLgH5syf2DkaEQqfkoDh'
var settings = {
    network: "mainnet",
    privateKey: "thePrivateKey",
    apiKey: "myApiKey"
}

var colu = new Colu(settings)
var privateSeed = colu.hdwallet.getPrivateSeed()

colu.on('connect', function () {
    var toAddress = '1HoVgpcDVygbKRCrZ8kHNwmWyXM6H4X1Us';
    var args = {
        from: [fromAddress],
        to: [{
            address: toAddress,
            assetId: assetId,
            amount: 3
        }],
        metadata: {
            'userData': {
                'meta' : [
                    {
                "key":"assetName",
                "value":"Entrada para el partido",
                "type":"String"
            },{
                "key":"partido",
                "value":"Real Madrid - Rayo Vallecano",
                "type":"String"
            },{
                "key":"fecha",
                "value":"22 abril 2017",
                "type":"String"
            },{
                "key":"jornada",
                "value":33,
                "type":"Number"
            },{
                "key":"puerta",
                "value":"1",
                "type":"String"
            },{
                "key":"seccion",
                "value":"2",
                "type":"String"
            },{
                "key":"asiento",
                "value":"17",
                "type":"String"
            }]
            }
        }
    }

  colu.sendAsset(args, function (err, body) {
        if (err) return console.error(err)
        console.log("Body: ", body)
    })
})

colu.init()

However, when I check the Colu Dashboard or the coloredcoins Block Explorer, the new metadata does not show up: http://coloredcoins.org/explorer/asset/Ua4VMXDsJ9bqyRty8zoNdiLS5rWfhDia8MK1hA/a83184fadfd99468011faf86dea2b7885aaf6f39dba25fe9d6a7aea415ef3325/0

Why is this not working?