I have experienced this. I just rotated about the Z axis to flip it the right way up and then saved as a Favourite. One thing I have experienced issues with is when a Revit object has variations which can obviously be selected within Revit but Archicad translates them all in to one fixed object so you end up with all the variations. It would be great if the add-on were updated to allow which option is required to be chosen.
Lee Hankins ArchiCAD 4.5 - Archicad 27UKI Apple Silicon 27.1.1 macOS Sonoma (14.2)