y Movement isn't blocked

[5igm]

I found when I logined the game, the system had restricted me to move to left, right, forward or back successfully. However, when I tried to move up or move down, the system did not stop me. Yep, for most players, they cannot fly, but ops can do it. I hope you can improve this plugin(or mod?).
Thank you very much.

[games647]

It's intended for better performance