Revit: Design Options in Linked Revit Files Not Respected as Room Boundaries

I was trying to assist on a project in the office today (using Revit® 2018.3), when I ran into this issue, documented by Dave Baldacchino nearly six years ago. I set up a simplified set of files for experimental purposes; the images below demonstrate the problem remains an issue at least through 2018.3.

I created a “link” model, that has one Design Option Set (Exterior Walls) which in turn has two Design Options, Option 1 (primary) and Option 2. Each Design Option has one Wall object, running in the Project North-South direction (up and down on the screen). These are identical, with the exception that the Wall in Option 2 is offset 10 feet in the direction of Project West (left on the screen).

The link model is linked into a “host” model (origin to origin; both files were started with the same template file). In a floor plan view, four additional Walls were drawn, and two Rooms with Room Tags added. In the image below, the link model is showing Option 1 (primary). The link…
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