checksum on contribution page doesn't hide account creation option

Using a profile with Drupal user account registration option set on a contribution page, the page will display the account creation section even if using checksum in url.

To reproduce :

• create a profile with Drupal user account registration = "Give option, but not required" or "Account creation required"
• add the profile to a contribution page
• send an email with a link to contribution page including {contact.checksum}

Result : information are pre-filled as expected but section about account creation is displayed that invite people to create an account or log (e.g. "Please enter a Username to create an account. If you already have an account please login before completing this form.")