Unable to clamp Geojson data source.

Hi added a geojson data to cesium ion but its not clamping when i tried to clamp.

**i tried **

Cesium.GeoJsonDataSource.clampToGround = true;

but still no result.

**Asset id of data is **65097.

What is the issue.

And there is issue with strokewidth also.I tried changing the strokewidth in sandcastle example but its not updating what is the issue?