I can't seem to write IFC objects that consist of multiple geometries as Multipatch - every time I try, the log says it wrote the correct number of features, but the shp file is empty. The only way I can get the geometries at all is by using the GeometryPartExtractor with Geometry Name = Body; however this separates the grouped items. When I try to use the Aggregator (with unique ID), it joins the parts together, but then I can't write them again! Is this simply not possible?

See Screenshot below, I want to write a Multipatch that's grouped like the selection - right now it consists of a separate cylinder and two blocks.