Properties are being removed from FeatureCollection

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I have created a .pbf file, but when I decode it, all the properties are removed from each feature.
I used the Getools geobuf libraries to do this, encoded and decoded successfully, I am gzipping the outputsream,

File file = new File("/Projects/geobufs/test.pbf");
GeobufFeatureCollection geobufFeatureCollection = new GeobufFeatureCollection();

InputStream inputStream = new FileInputStream(file);
SimpleFeatureCollection decodedFeatureCollection = geobufFeatureCollection.decode(inputStream);
inputStream.close();

FeatureJSON fjson = new FeatureJSON(new GeometryJSON(DECIMALS));
StringWriter writer = new StringWriter();
fjson.writeFeatureCollection(decodedFeatureCollection, writer);
String geoJSON = writer.toString();
logger.info(geoJSON);

I download the file

var geobuffURL = "http://localhost:8080/geobuffer/test.pbf";

var oReq = new XMLHttpRequest();
oReq.open("GET", geobuffURL, true);
oReq.responseType = "arraybuffer";
oReq.onload = function(oEvent) {
var data = new Pbf(new Uint8Array(oReq.response))
console.log(data)
var geoJSON = geobuf.decode(data);

console.log(JSON.stringify(geoJSON));
//var layer = L.geoJson( geobuf.decode(data)).addTo(map);
}
oReq.send();

and it strips the properties from the geoJSON.

I am attaching both the geojson, and the pbf I encoded.

[test.files.zip](https://github.com/mapbox/geobuf/files/2670767/test.files.zip)

Start with test.files.zip, especially the supplied GeoJSON and test.pbf, and trace the JavaScript geobuf.decode(data) entry point used in the browser example. Compare the original and decoded feature properties; done means decoding the attached PBF preserves those properties in the resulting GeoJSON.

Written by the indexing model from the issue text.