The following geojson-vt and vt-pbf versions ouput a .pbf with a non-encoded buffer, : "geojson-vt": "2.4.0", "vt-pbf": "3.0.1" Whereas the following versions ouput properly encoded PBFs: "geojson-vt": "^2.4.0", "vt-pbf": "^2.1.2"