When exporting a Model to STEP all surfaces that are visible in the active combined state should be exported if the option “surfaces” is selected. The paradigm should be “what you see is what you get”.
The export result should always represent the current situation of the model and include all visible objects at the time of the export. Right now the use of isolated Layers gives a different result than an export with shown layers. The export should always be independent of the used layer functionality.