Uploading files during page creation step will mark XWikiGuest as creator

For reproduction steps, I used the Office Document Viewer macro, because of the reference parameter, which allows uploading files.
Please note that this is happening only when creating a new page

Steps to reproduce:
1. Login with an user (I used Administrator)
2. Start creating a new blank page
3. Chose a title and edit the page content
4. Add an Office Document Viewer Macro
5. Upload a new file in the reference parameter and click submit
6. Save and View the page

Expected result:
The page creator, displayed in the right bottom corner of the content, it's the current user

Actual result:
XWikiGuest is displayed as creator instead, while the correct user is displayed in the page history