Single-floor-height walls will occasionally spawn outside of the mansion itself.
Seed: -6549889454106593879
Coords: 302396/79/-3347
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I found a good example of this in a world I'm testing in (details below). From what I can tell these appear to be generated cobblestone, that is meant to be "supporting" the structure, to ensure it doesn't look like it's floating. But for some reason this is occurring away from the main structure, under things like trees, or even in nearby surface caves.
Seed: -6549889454106593879
Coords: 302396/79/-3347
Also, I found this Mansion in a world generated in 16w39c, so I can confirm this happens in this most recent snapshot.
Please provide the seed and coordinates.