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DonFerrari said:
If a better game is the result then all is good. But go through all the cleared stages again shouldn't be necessary.


To be sure that in the process of fixing the identified problems the developers don't accidentally create new bugs, full retesting is necessary.  Typically this is called regression testing.  The Devs will want to do this themselves before submitting again.

From Sony's perspective, each software iteration is likely treated as a completely separate submission that will require to go through their full certification.