So this has been an issue for me for many versions of citizens and minecraft but I still have the problem. I have 15 or so NPCs around my spawn and whenever you are around spawn, they spam in and out of the tab list. I have it disabled in the config too.
This is an oddity imposed on us by minecraft/mojang currently; not much we can do about it :/
I figured as much but I recently played on another server and they used citizens but they didn't seem to have the issue
And when I say recently, I mean a few minutes ago
Im Having The Same Problem