Which Umbraco version are you using? (Please write the exact version, example: 10.1.0)
Umbraco CMS 13.5.3
Bug summary
Backoffice users can still add notifications to content nodes, even after their permissions have been disabled from their permissions in Umbraco CMS 13.5.3
Specifics
The user with disabled notifications in permissions:

When the user goes to a node and wants to add a notification:

They can still add them:

Steps to reproduce
- Go to the backoffice of Umbraco
- Navigate to the user's section
- Go to a user or invite a new one
- Edit the user group that the user is added to
- Disable notification permissions for the user.
- Go to a content node and try and add some notifications
- The notifications are added successfully
Expected result / actual result
I would expect the user not to be able to see and add or edit new notifications on the content node when it has been disabled.