Changing a contribution status from "completed" to "Cancelled" or "Refunded" breaks Pledge payments

I am able to reproduce this in the public sandbox for testing 4.3.

Steps to reproduce it:
1) Create a new pledge for 1200. to be paid in 12 installments ( I chose monthly as the frequency, but any frequency can be used)

2) Make the first pledge payment and choose the actual amount paid to be 300, (When adjusting the amount, stick with the default option of adjusting the remaining schedule.)

At this point everything is fine

3) Click on the "Edit" link for that 300 pledge payment , then click on the "Edit" button

4) In this screen, change the contribution status to cancelled or refunded then click "Save"

At this point the rest pledge installments are a mess. There are no longer enough "pending" or "overdue" pledge payments to be able to record the rest of the payments to pay off the pledge.