It's because of the consequential relationship. In a vote on Lib-5, because of the changes to the schedules, we would have schedules 1 and 2, whereas I think in Lib-4, the part it's deleting refers to “the schedule”, and if you've removed them, then that doesn't make sense anymore. So it's just consequential.
Lib-6 is just changing the title of the schedule to read “Schedule 2,” which seems a little more obvious.