How to fix "Nocom Exploit" 1.16.5

Hello,

I have a problem with my server. Cheats are allowed but there are some that are too powerful. This is the exploit making it possible to find players by scanning the map (via Rusherhack and its addon: nocom exploit for rs +).

The players find the others thanks to the chunks where they are located and update themselves. Even at great distances.

I have already downloaded the latest version of server.jar from Paper in 1.16.5, but that does not correct the problem. I imagine I need to modify the server core but I don’t know how to do it.

If anyone can help me, thanks in advance!