Scenes, parent scenes in Makie

First, what is the best place to get fast feedback on Makie?

I created a master scene and a subscene as

parent_scene = Scene()
child_scene = Scene(parent_scene, show_axis=false)

If find that the child_scene is translated with respect to the parent. Why would that be, and how can that be prevented? How can it be measured?

Is there any document that describes the internals of Makie? Is there a whitepaper?