Scaling a 3D tileset in CZML packet

Hello, I am trying to load a 3D tileset via CZML file. While I am able to load the tileset to desired position and orientation via CZML properties, but Scale property does not seem to be working.

I have tried adding ‘scale’ property to the tileset packet by providing Cartesian3 values as described here, but it does not take effect.
Here is my CZML packet :

    id: "ContainerCafe",
    name: "ContainerCafe",
    position: {
      cartographicDegrees: [
    tileset: {
    scale: {
      cartesian: [100.0, 200.0, 300.0]


Any assistance / insights would be highly appreciated.
Thanking you!