This is true, but at the same time presumably you should be able to assign a Plant object + all it's components to non-None classes + be able to turn None off should you for some reason want to + the Plant remain visible...????   For example all my Walls, Slabs, Roofs, etc remain visible when I turn None off (because none of their parts are assigned to None)...   Just interested to know why Plants are special in this respect
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