Confluence Word export redirects to Viewport 404 page

Confluence Word export redirects to a 404 page in Viewport when the viewport path is set to /

Steps to reproduce:

1. Create a space and create a viewport

2. Set the viewport path to /

3. Open a page in confluence and Export to Word

Expected result:
Page is exported to word document and download is started

Actual result:
Redirected to Viewport 404 page