Notifications not playing sound and do not stay in Notification Center

Description of the issue:
Whenever I receive a notification (for example new e-mail from Gmail) the notification shown does not play any sound and it doesn’t stay in notification center so it goes easily unnoticed.

How can this issue be reproduced?

  1. Navigate to this site https://www.bennish.net/web-notifications.html
  2. Click on Authorize
  3. Accept the Request to show notifications
  4. Click on Show

Expected result:
The notification should play a sound and it should remain on Notification Center

Brave Version( check About Brave):
Version 1.20.103 Chromium: 88.0.4324.152 (Official Build) (arm64)

Additional Information:
I have checked in the System Preferences and Brave has all the permissions it should have for notifications.