while rendering a gltf on cesium getting error like "TypeError: i.clone is not a function"

Hi There,

1. I have a gltf as a service url but when using this service url directly getting cross origin error, so I wrote a proxy in node js, now getting gltf data,

2. but when rendering on cesium using “viewer.entities.add” I am getting the error like “TypeError: i.clone is not a function” with black screen.

3. My cesium version is 1.56.



can you provided an exemple of the gltf and of your code ?