Why element and cell disappear when export IFC 2x3 CV2.0, then how to solve?

Hi OpenBuilding Forum, 

Lately when I use IFC 2x3 to export the model as deliver and cooperation model, then will happen element disappear. As the picture below.

My model is ok in export IFC4, but when I export IFC2x3 cv2.0 that would happen geometric disappear. I had added the catalog into my model and sure it is no information error warning.

      

to avoid is IFC viewer issue, I had open the IFC file in Openbuilding, then realize that is missing geometric description indeed.

The elements are TriformaSoild or furtureSolid, also checked the properties, but didn't figure out the issues.

  

Does anyone know what causes this happens and how to solve it?

By the way, my software is OpenBuilding update7 version.

Thanks and Regards, 

Lynn

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