We ran into a possible bug. We're running Totara v15, so still using legacy notifications.
We had some seminar events that had been cancelled a while ago. They had some users selected as Trainers in the Event roles.
These users received Seminar registration closed notification at the time when the event sign-ups were supposed to be closed. These are the notifications I'm talking about (screenshot from Totara documentation)

I also noticed that in the notification settings the roles are Learners, not Trainers for some reason:

Is that something that will be fixed with the centralised notifications?