Style mapping for imported Word documents does not show my InCopy styles

I imported a document from Word (via File > Open) into the latest version of InCopy CC for the first time today and there appears to be a bug in the style mapping modal. The right-side drop-down menus do not show any of my InCopy styles. It only gave me the option of the built-in styles (e.g. Basic Paragraph Font and No Paragraph Font).