As far as I could find out, a field is indeed either walkable or swimmable, neither both. Immovables can only be placed on walkable fields. So it seems to be enough to check either is walkable or has an immovable.
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As far as I could find out, a field is indeed either walkable or swimmable, neither both.
Immovables can only be placed on walkable fields.
So it seems to be enough to check either is walkable or has an immovable.