Thank you very much for the question and I am very sorry for the experience!
It turned out to be an issue with Revit's IFC import. As Christophe has mentioned, if Solibri reads the file correctly, the IFC export from Archicad should be correct. Unfortunately, we cannot do anything about it in this case. I really hope Autodesk will fix it soon!
Thank you very much for your understanding! If you have any further questions, feel free to ask me again!
Technical Support Engineer