Empress Defeated (in kMST)

Not really relevant, but I believe that the Zakum quest scripts were leaked a few years back.
I think even fiel might have posted them, but not sure.
The pserver has fixed bugs that plague GMS, such as dark meta, empress, cwkpq(before official) etc, so it is shown that they can fix these bugs.

They didn't "fix these bugs", they simply never had them.

Consider an entire class of computer science students. All are given the same homework assignment: given a "client" that knows how to display a chess board and pieces, create a server that allows two people to play chess against each other.
Each student will create a different program, with different code and different bugs. But they will all look alike to the users, because the graphical front-end is the same and the rules of the game that the server implements are the same.

That's how it is with pservers and the real server. They perform the same functionality, more or less, but inside they're entirely different, and there's no reason to expect the same bugs to show up in both.