It seems strange that I create an epic and child issues inside, but once I tried to import my Agile next-gen projects into Portfolio, all epic issues have the same Hierarchy level, and it seems the child issues cannot be linked with my Epic issues, where is the problem? I tried to do Hierarchy setting, still cannot arrange my issues properly, what should I do? It seems the hint for hierarchy level configuration is just for classical Agile project? What about next-gen projects???