Is your feature request related to a problem? Please describe.

Wind Charges are able to be used on people with PvP disabled, allowing people to kill people via the void, nether, etc.

Describe the solution you'd like

A way to disable wind charges thrown by players from affecting other players if they have PvP disabled.
Would probably be something along the lines of checking if projectile is launched by player hits another player, cancel the event, etc.

If using the free version and you don't mind using a beta version, try https://ci.codemc.io/job/ChanceSD/job/PvPManager-v4/
If using premium version it will be in next update.

You mean the knockback right? I was testing the damage and that seems to be blocked.
Also, is this using the free version? I'm going to try to get this improved in a dev build.