The creator of a page created through a change request is the user who published it, not the user who created it

When a user creates a page through a change request ("request creation", or "Save as change request"   on a new page), and another user later publishes that change request, the newly published page  gets the publisher as its creator.

The "Created by" information displayed on the page  (and everything  else relying on doc.creator therefore credits the publisher instead of the person who actually created (authored) the page.

This happens whether or not the publisher modified the change request before publishing it.

Steps to reproduce:

1. User A creates a page and saves it as Change Request. (or clicks directly at creation on "Request creation").
2. User B  (that has enough rights to publish the CR), opens the change request and clicks "Review" and then "Publish". 
3. Open the new page (created by User A at step 1) and look at the "Created by" information.

Actual result: Displays "Created by User B" (publisher).
Expected result: "Created by User A", the user who actually created the page.