Hello, I am sorry but I did not receive a notification for your last message. To answer your question, the answer is no; I have retried with every new version but it doesn't change anything.
As soon as I reactivate the plugin, the NPCs become very slow to react, as if they don't see me. I have to shoot them for them to shoot back at me.
And another thing, no, it's a large server and the problem isn't lag, but rather that the game's NPCs no longer see me immediately; they don't shoot at me immediately when they see me, as if they had been made "dumb." However, I have other plugins like:
https://codefling.com/plugins/monument-events-all-in-one-events
https://chaoscode.io/resources/zombiehorde.120/
which, despite injecting many NPCs, do not have this problem, and their own NPCs are not impacted by this strange behavior that the vanilla game NPCs are exhibiting.
If necessary, I can give you a live demonstration to show you how the NPCs behave with and without the plugin. I can even install a more verbose version of your plugin to allow you to debug in real-time, or anything else!
I am truly sorry because I really love your plugin, but for the moment it is impossible for me to use it.
Thank you in advance.