Bug Report

Type /ver NametagEdit and post the output.

NametagEdit version 4.5.23
Authors: sgtcaze, Cory, Lorenzo0111 and Aurelien30000

What version of Bukkit/Spigot/PaperSpigot are you using? Type /ver

This server is running Paper version git-Paper-"662261c1" (MC: 1.12.2) (Implementing API version 1.12.2-R0.1-SNAPSHOT)
Previous version: git-Paper-e3bf31e5f (MC: 1.12.2)
Checking version, please wait...
Unknown version

What plugins are you using? Type /plugins

ProtocolLib, ViaVersion

Please explain your issue. How do you trigger it?

Join with 2 players on a 1.12 server, with viaversion so u can join on 1.20.5. It will send invalid data and disconnect the client with 'Invalid network packet'

Are there any errors in the console? Please use: https://pastebin.com

No, it triggers client sided

Sorry for the delay, you may have a look at this: #912
Please let me know about it! Thanks :D