Hey @fcegnam ,
Welcome to the community! Feel free to Introduce yourself 
to the community if you want to! 
Thanks for sharing the sample file. It really helps with debugging. Looks like our mapping conversion doesn’t cover the case where single object contains two geometry. @AlanRynne @clrkng this looks like an interesting case.
Until we fix this, you can explode these objects, join it back and assign the mappings again. It should get received just fine in Revit.
Thanks for reporting, keep these coming.