In software development projects it is a consistent issue.  One could argue that it will never change.  I am not hear to tell you how to fix that point.  I am hear to tell you to plan for it.  The word is process with a pragmatic side to it. 

 The key is the QA Leads need to take control of the situation.  Requirements can change in the middle of Test Preparation (Test Plan, Test Scenario / Test Script development) and even Test Execution.

 It is important that we communicate out to the project teams in a professional manager.  This includes the state and rework.    This is simple proactive communication.  

It reminds me of the a famous Movie line from ‘Good Will Hunting’.  

 Quote:  “It’s not your fault.  It’s not your fault. It’s not your fault.”

 Your ‘fault’ is if you don’t communicate and properly report out status.  You need to do it quickly and effectively.