I am experiencing the same issue as everyone else. I am relieved that it’s not just my client/system.
With 8.2.5’s implementation the game will freeze/stutter for a brief moment (<1 sec or so) every time I complete I world quest. It doesnt matter where or what type (Nazjatar, Arathi, Zuldazar…it’s all the same) and it makes zipping through world quests annoying. Nothing else bad happens - rewards, reputation, relevant achievements are all applied as per normal. It’s just a small stutter that occurs each time it completes.
Edit - looks like they are at least aware of the issue and are looking into it