Hi!
This is not a new issue, but I saw recently the problems with instancing of grouped items was resolved so I'm hoping this can be addressed as well.
In this simple scene I have loaded Genesis 8 Female and a sphere primitive. I positioned the sphere at her right hand and parented it to her. Then I created 10 instances of her. Notice in the DAZ viewport all 10 instances have the sphere correctly positioned at her right hand, but in the Octane viewport the G8F figure is instanced properly while all of the instanced spheres are in the same location at the center of the image. Refreshing the geometry / reloading the scene does not correct it. I attached the scene file here if you want to take a look at it.
I did a scene in the past where I needed a large number of soldiers standing in formation holding weapons. Only workaround I could figure out was to export the soldier and weapon as a single OBJ, import it back into the scene, re-assign the materials, and then instance the merged OBJ - definitely not ideal.