Samples in the rome-gltf repository can not be displayed due to errors

I tried to display the following model in Cesium.js.
https://github.com/mrdoob/rome-gltf/blob/master/files/models/life_soup/quadruped_fox.gltf

However, it was not displayed due to an error.
http://jsdo.it/cx20/6z4e
```
Cesium.js:479
[Cesium WebGL] Shader program link log: Too many vertex attributes.
```

Is this due to the limitation of Cesium.js?

Start by reproducing the display failure with files/models/life_soup/quadruped_fox.gltf in the linked Cesium.js example at jsdo.it/cx20/6z4e. Inspect the reported shader program link log, especially “Too many vertex attributes,” and determine whether the failure comes from the model or Cesium.js. Done means documenting the cause and adding a focused fix or confirmation if the repository contains a relevant test path.

Written by the indexing model from the issue text.