Can I set HasTransformHierarchy to false so that it uses the bones from an Avatar?

If I drag a model (with optimize game objects on) into a scene, the mesh will be visible. However, if I create an Animator, then a SkinnedMeshRenderer in a child component, and set all the same properties as the model prefab, it won't be visible. Inspecting the scene YAML, the only difference between the states of these is "m_HasTransformHierarchy: 0" in the model, and "m_HasTransformHierarchy: 1" in my generated case.

Is there a way to set this property to false, so it will use the optimized hierarchy inside the avatar?

 

I went to the same problem, unfortunately today hasTransformHierarchy is still readonly, since there's no answer yet, I'd like to necro this question and share my solution.

Code (CSharp):

1. using(var so = new SerializedObject(animator))
2. {
3.     so.FindProperty("m_HasTransformHierarchy").boolValue = false;
4.     so.ApplyModifiedProperties();
5. }