I expect the IFC import “problem” is caused by the Model View Definition (MVD) of the IFC file.
SOFiSTiK 2022 imports IFC 2x3 and IFC 4 files with an “Structural Analysis View 1.0” MVD.
The IFC Manager Extension exports the IFC model with an “Coordination View” MVD.
The native IFC2x3 export exports the IFC model also with an “Coordination View” MVD and the native IFC4 export exports the IFC model with an unknown “TrimBim” MVD.
I found on the internet that previous versions of SOFiSTiK also imported IFC2x3 Coordination View and the IFC4 Reference View.
Here is an informative video explaining more about Model View Definitions.
