Scheduled reminder linked to deleted event is not deleted: bug or feature?
I wouldn't say its a bug, rather missing feature. The schedule reminder UI also allows to update the reminder to include more events(for reminder which was configured from events tab) so it is additional discussion to delete the reminder if its only used for deleted event or disable it so that we maintain the log history if incase any reminder was sent for the reminder.
Would appreciate if you can send a PR to core to delete the reminder.