I was converting the model attached below with an outdated version of IfcOpenShell and experienced missing elements, probably relating to #466 so I updated to the latest version of IfcOpenShell but then I discovered that some elements seem to be inverted (see screenshots below). I added the model as .ZIP file.

As clarification, in the older version of IfcOpenShell the inverted elements were showing correctly.
Could you please have a look at what could cause this issue? Thanks in advance!

Couch

Cupboards

Duplex_A_20110907_optimized.zip