Notifications are not received if the user watches only a page on Oracle

STEPS TO REPRODUCE

Preconditions: Have a fresh instance of XWiki 10.9 configured with Oracle (11.2).

1. Login with Admin
2. Configure Mail Sending from Adminster Wiki > Mail > Mail Sending
3. Create an user (e.g. U1)
4. Login with the user (U1)
5. Create a page (e.g. Pag1)
6. Go to Notifications > Settings and delete the inclusive filter for Pag1
7. Go to Pag1
8. Unwatch the Wiki and watch only this page (so the filters will be: Wiki - exclusive; Pag1 - inclusive)
9. Login with Admin
10. Edit and comment Pag1
11. Trigger the 'Notifications daily email' job from Scheduler.WebHome (default setting on user profiles)
12. Login with the user (U1)
13. Observe the notification list and the mail received

EXPECTED RESULTS

The notification list and the mail received contain the two events done by Admin on Pag1: edit and comment.

ACTUAL RESULTS

No notifications are received by the user on both notifications list and email when only the respective page (Pag1) is watched. However, if the user (U1) watches the page and its children, the notifications are received.

The issue was reproduced only on Oracle (11.2), also on XWiki 10.8.1.