I'm not sure if this bug has been fixed, but there is currently an issue with plugins like this (https://www.spigotmc.org/resources/%DB%9Egk-%E2%80%A2-anticheat%DB%9E-protect-your-server-from-hackers-and-bots.75691/) abusing the ClickEvent feature to send commands starting with ".". The best way to fix this is to prevent the Impact command system from being triggered when the ClickEvent is fired.
(When the user clicks on the chat message, sendMessage from Screen.class is ran with toHud set to false.)
I'm not sure if this bug has been fixed, but there is currently an issue with plugins like this (https://www.spigotmc.org/resources/%DB%9Egk-%E2%80%A2-anticheat%DB%9E-protect-your-server-from-hackers-and-bots.75691/) abusing the ClickEvent feature to send commands starting with ".". The best way to fix this is to prevent the Impact command system from being triggered when the ClickEvent is fired. (When the user clicks on the chat message, sendMessage from Screen.class is ran with toHud set to false.)