A `UCustomizableObject` is causing a ~4s freeze when loading all its subobjects.

Development Pipeline & Plugins
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Steps to Reproduce

  1. Make a bunch of `UCustomizableObject`s with a complex, big hierarchy for different body parts.
  2. Have a `TSoftObjectPtr` pointing to the root `UCustomizableObject`.
  3. Load it with `FStreamableManager::RequestAsyncLoad`.
  4. After loading, the editor will hang for some seconds, because the root object is loading all its chilcren in the main thread.