Trying to create self-referential formula and/or tree view of self-related Dataset

[Chr1sG]

[DONE] Many-to-many relationships should be usable for levels in lists

I have [Product] *------* [Feature]. (Features belong to products, but some features span multiple products; e.g. “2FA” is a feature of both the backend CMS and of the mobile app). There is also a [Product] ----* [Bug]. (A product can have bugs.) When I create a list, I can add Bug as a second level, but not Feature. Why not?