I understand, thanks for replying. Yeah, its not a bug, its a missing feature. Its not the only software that uses symbolic representations of plancuts instead of real horizontal sections. I`m a student and I`v been using Allplan from Nemetschek in the past but iam not satisfied with it anymore. Its less flexibile and user friendly than Archicad. And it stands worse at floorplan representations. Revit represents all geometry correctly and is very intuitive in modeling but runs slow in my computer.
I think it wouldn`t be such a hard update to do for Archicad though. I`v noticed that the meshes (or roofs) edges are correctly shown in floorplan. But if i use the Mesh to roof tool for ex, the resulting geometry has some problems with the mesh faces intersections. But i think they resolved it somehow in the Archicad 13 version with the option to choose any angle for the roof border.