Type /ver NametagEdit and post the output.

4.2.0

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

1.12.2

What plugins are you using? Type /plugins

essentials
titlemanager

Please explain your issue. How do you trigger it?

Is there a way to support nicks? let us use a placeholder instead of the default playername
%vault_prefix% %essentials_nick%

and disable the playername from showing in the list ?