Mail events are not filtered properly

STEPS TO REPRODUCE

1. Create the following pages: "a/b/c/d/e/"
2. Login with an user (U1) with a valid email address
3. Click on the Notifications bell
4. Go to Notifications Settings
5. Select Daily for "Email Frequency"
6. In the Applications Preferences set all Notifications ON (e.g. for Pages, both for "Notification menu" and for E-mail)
7. Click on the "Add filter" button from the Custom Filters section
   Location -> Page "c": "Home/a/b/c/"
   Action -> Ignore the event
   Events type (Pages) -> A page is modified
   Channel -> Alert
8. Click on the "Add filter" button from the Custom Filters section
   Location -> Page "d": "Home/a/b/c/d/"
   Action -> Ignore the event
   Events type (Pages) -> A page is modified
   Channel -> Email
9. Login with Admin
10. Update the pages: 'a','b','c','d' and 'e'
11. Trigger the "Notifications daily email" job from Scheduler.WebHome
12. Login with U1
13. Look at the notification list
14. Check U1's received emails

EXPECTED RESULTS

On the notification list only the update events for pages 'a' and 'b' are displayed while on the received email, the update events for pages 'a', 'b' and 'c' are displayed.

ACTUAL RESULTS

Both on notifications list and on Email, the user receives notifications for 'a' and 'b' pages.

The issue reproduces also for "Notify of the event" filters. If a "Notify of the event" filter is added for Location -> Page "c": "Home/a/b/c/" (for Email), then on Email the user receives notifications for 'b', c', 'd' and 'e' pages while it should only get the update events for pages 'c', 'd' and 'e'.

The issue does not reproduce on XWiki 13.1.