Word templates doesn't export mappings on Cover page

Description
On a Word template, if you insert a Cover page and place some mappings on it, Xporter will not export those mappings.

How to reproduce

1. Create a new Word template
2. Insert a Cover page
3. Add a mapping as for example ${Key}
4. Export it from an issue

Actual result/Attachments
It should export the mappings.

Expected result
It doesn´t export anything on the Cover page.

Attached is a template with a Cover page and the Key mapping to replicate the issue.
Test with cover page.docx