That is not 100% correct. Yes, it keeps the order but it does not produce a hierarchical layouted graph tree. It only produces two hierarchical levels and reorder the layers I a very strange way. But the worst thing is, that it draws the edges “around the nodes and from behind into the nodes”. Therefore, that is not an option to resolve the problem. In any way, I spent now several hours to reorder the graphs after applying the hierarchical layouts. That was the best way to handle it. Here some refinement in the ordering algorithms is needed.
Thanks for your reply any way. If the developers need a MWE for this problem, feel free to ask for one.