I want to move the Model (Entity or Primitive) along the 3DTile

I’m currently trying it with Model Entity (ModelGraphics), but Polyline etc. can be drawn along the 3DTile with clampToGround, but Model Entity does not have such a property.
In addition, since SampledPositionProperty is set in Positions,
I am unable to apply this Sandcasle sample.
How can I make the Model move along the 3DTile if I set the SampledPositionProperty in Positions?

Trying code Sandcasle

As a workaround, I’m currently adding another Entity to achieve the expected behavior. Sandcasle

Is it impossible with one Entity?