Bug Report

Type /ver NametagEdit and post the output.
03.04 18:57:37 [Server] INFO NametagEdit version 4.4.0
03.04 18:57:37 [Server] INFO Authors: sgtcaze and Cory

What version of Bukkit/Spigot/PaperSpigot are you using? Type /ver
CraftBukkit version git-Spigot-642f6d2-57ab4cf (MC: 1.12.2) (Implementing API version 1.12.2-R0.1-SNAPSHOT)

What plugins are you using? Type /plugins
CoreProtect, AsyncWorldEditInjector, LuckPerms, PlaceholderAPI, PlugMan, NametagEdit, ForceField, AsyncWorldEdit, bookPlugin, EpicWorldGenerator, PerWorldSpawn, ViaVersion, Tablist, Vault, ViaBackwards, WorldEdit, Essentials, PerWorldInventory, PlotSquared, Multiverse-Core, ProtocolLib, Citizens, CustomGUI, EssentialsChat, SimpleAlias, Multiverse-NetherPortals, CommandNPC, EssentialsSpawn, RedProtect, HolographicDisplays, LiteBans, MCSFPlugin, ShopGUIPlus, Jobs, SilkSpawners, WorldGuard, LockettePro, MoreVaultPlus

Please explain your issue. How do you trigger it?
The name tags refuse to appear on tab, rather it be player or permission based. I've got all the perms set up correctly, and even have set a few player names manually (/nte player prefix) but they refuse to show up. I'm unsure if it's a plugin conflict or not, but it used to work fine.

Are there any errors in the console? Please use: https://pastebin.com
None.

EXTRA:
Config.yml - https://pastebin.com/izA2FTqr
Groups.txt - https://pastebin.com/PXPyFtAx
Groups.yml - https://pastebin.com/fb43NBC2
Players.txt - https://pastebin.com/sURnB7yW
Players.yml - https://pastebin.com/xPNMZ84a

03.04 19:08:26 [Server] INFO Loaded Groups
03.04 19:08:26 [Server] INFO Group: Leader Permission: Formatted: CONSOLE

Looking through it, it seems like it just doesn't update? Leader was only added after all this, so I'm unsure. Changing it at all still refused to change the tab prefix.