Thanks for the reply.
Thanks for your patience. We have investigated the issue and found it is Adobe related issue. There is an image (image1.png) inside the word document (unsupportedColorSpace.docx). This image uses palette to store color information. It is a well-known problem that Adobe Illustrator can’t work correctly with these kind of images (https://www.google.co.nz/search?q=adobe+illustrator+unsupported+color+space).
If you open the word document and save image as a 32-bit image, the problem will be fixed. You may also send information about this issue to Adobe team.