Right now when i dispose container his child is never disposed, so have RAM leak and possibly VRAM leak.
But its actualy but this is a controversial decision because some time when i dispose container i can lose some Objects3D what can used in other places. But i think it depend on app architecture if u didnt want to dispose some childs just remove them from container. Or override dispose method. Maybe also is good idea add flag dispose(disposeChild:Boolean = false), for compatibility