for tests (QTI 1.2 and 2.1) the performance summary can be shown or hidden. if it is hidden, the change log should not show any score.
The same for manual correction. If the manual correction is activated, the score in the change log should only be shown if the correction is visible as well
To keep things simple, the user change log should only be displayed when the score is displayed to the user. When the score is not yet visible, the change log should be hidden from the user.