Why did the Scheduled change order get promoted automatically?

Since the Autocomplete on Cancel option is enabled by default from update 23A, all scheduled change orders move to the Complete status on cancellation of the last change line. This is applicable to new and in-progress change orders.

Let's say that the first three change lines are complete, and the last change line is stuck in the Scheduled state. You cancel the scheduled change line, and the change order moves to the Completed status.