Live email notifications on subwiki don't work with pre-filtering disabled

STEPS TO REPRODUCE

Preconditions:

• The Mail Sending should be configured on Main Wiki
• A local user exists on subwiki and has an email address set in its profile

In webapps\xwiki\WEB-INF\xwiki.properties set (and un-comment):

• notifications.emails.live.graceTime = 1 to enable the sending of e-mails after 1 minute. 
• notifications.eventPrefilteringEnabled = false

1. Login as Admin
2. Create a subwiki
3. Log in as a local user on the subwiki (with email address in the profile)
4. Click on the bell in the top right corner
5. Click on Settings, in the right side of Notifications
6. Set "Email Frequency" to Live
7. Set ON all toggles in the Email column
8. Log in with another user or with Admin
9. Create/update/delete a page

EXPECTED RESULTS

Email notifications are sent for respective events to the user that has the notifications set to ON, Live.

ACTUAL RESULTS

No emails are sent. For emails to be received, notifications.eventPrefilteringEnabled must be set to true.

I've tested also on XWiki 11.10.13, 11.10.3 and 11.9 and apparently no notification mails could be received from subwiki.