Short description of error
There is no way in 2.8 to hide the object that is duplicated. In 2.79a Cycles would do that automatically for rendering. In 2.8 we don't have this for any system. Maybe we should reproduce the old Cycles behaviour
Exact steps for others to reproduce the error
- In 2.79a with Cycles it renders fine (the plane and the middle cone are hidden)
- In 2.8 change render engine to eevee and F12: only the plane is hidden, the middle cone is still there.