Table of contents does not display page hierarchy correctly in email notifications

Preconditions: The XWiki instance has the Mail Sending configured. An user (e.g. U1) is created and has a valid e-mail address set on its profile.

STEPS TO REPRODUCE

1. Login as U1
2. Go to Notifications > Settings
3. Set all Pages Notifications to ON
4. Login as Admin
5. Create the following page hierarchy: /aaa/bbb/ccc/ddd/
6. Trigger the "Notifications daily email" job (as set by default in user's profile) from Scheduler.WebHome
7. Check the notification email received by the user U1

EXPECTED RESULTS

In the email notification received by U1, the TOC displays the page hierarchy correctly, as created by Admin ('aaa' is the parent, 'bbb' is child of 'aaa', 'ccc' is child of 'bbb' and 'ddd' is child of 'ccc').

ACTUAL RESULTS

The page hierarchy is incorrectly displayed in TOC: 'aaa' is the parent and 'bbb', 'ccc', 'ddd' are all children of 'aaa' (screenshot attached). However, in the breadcrumbs, the page hierarchy is properly displayed.