Hi Petr,
Could you send the model to marko.myllymaa at trimble.com?
Problem could be that IFC plugin 5.29 considers those objects to be falsely created. It could be that objects do not have volume as the object surface is not complete etc. I will investigate the model after I get it.
We are updating the ifc plugin on the next Trimble connect Desktop release, we could take a look on this issue.
Best regards,
Marko Myllymaa