However if an 8am job finishes before 9am, an additional 9am job is scheduled.
Taking with support (case 00932681), it seems this is because the scheduler runs from 12am, regardless of the job start time. So this 8am run was technically a 6am run, but due to the backup window it was only allowed to start at 8am. And then in case of a few replication jobs, it started a 9am run as well because 8am one finished in under 30 minutes.
This wasn't an issue until v8 update 2 improved my backup times
