Thank you for your quick answer.
I would also say that you are right. I’m not a programmer but as the calendars work correct (including the names) in every other app it suggests that there is a problem with Waze.
And yes, you are right. In Waze you can select or unselect calendars for which you want to receive notifications that it is time to leave from your current location to be in time for the appointment. As you only want that for some calendars (it does not make much sense for garbage collector calendar or also the Bundesliga calendar for example) Waze allows to deactivate/activate the calendars you like these notifactions or not.
I posted your lines in the Waze forum and hoping that someone looks into the problem.