I've tried from both plan and 3d, same result. The floor plan cut plane is above the morph and object. Attached are images of the plan view and also floor plan settings for the morph prior to saving as a GDL object.
I noticed on the Graphisoft tutorial for saving objects, they show changing the pen of elements below the top as white in order for them to be masked, but that doesn't seem to make sense.
https://www.youtube.com/watch?v=4-Q0SQX21wQ
Thanks
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Sloan Springer, AIA
www.springer.archi
ArchiCAD 24 Solo\\ 2017 MacBook Pro 13" \ 2.3 GHz Intel Core i5 \ 16 GB RAM \ macOS Catalina 10.15.7