Bug Report

Type /ver NametagEdit and post the output.
[07:32:08 INFO]: NametagEdit version 4.4.2
[07:32:08 INFO]: Authors: sgtcaze and Cory

What version of Bukkit/Spigot/PaperSpigot are you using? Type /ver
[07:34:00 INFO]: This server is running Paper version git-Paper-137 (MC: 1.14.4) (Implementing API version 1.14.4-R0.1-SNAPSHOT)

Please explain your issue. How do you trigger it?
I'm not entirely sure of the pattern yet, but certain prefixes do not work. Examples:
Prefix: '&5[Subscriber]&7 ' (There's a space in prefix but not in the name)

http://prntscr.com/ok9bp4

Prefix: '&5[Subscribe]&7 ' (Seems removing the "r" allowed the space to process?)

https://prnt.sc/ok9cjv

Prefix: '&5[Subscribe test]&7 ' ("t]" seem to mess up the prefix)

https://prnt.sc/ok9duq

Prefix: '&5[God Donator]&7 ' (I don't know what's happening here. There's no pattern. The name has no space, doesn't "process" the &7 color code, and even removes the beginning letter from the player's name)

https://prnt.sc/ok9i3r

Prefix: '&1Server Admin&7 ' (I wanted to say the brackets were the only constant, but even when I remove them, the second space doesn't get processed)
(Yes, I also tried Prefix: '&1Server Admin&r &7') - When I do that, it seems to ignore the &7 after the second space, because my name is white (due to &r).

http://prntscr.com/ok9kw1

I can do more examples to further narrow the issue, but I'm hoping this may be enough to find a solution as to why the prefix parsing seems to be a little bit messed up.

https://ci.nametagedit.com/job/NametagEdit-Dev/lastSuccessfulBuild/artifact/target/NametagEdit.jar

Try that build

I tried that build, restarted and the issue is still occurring.

Run the command again to set prefix.

Alright.
I run:
/nte group New prefix &5[Subscribe test]&7
and result:

I'm unsure why you close the issue when you're not even sure if the issue persists in the most updated build or not (which it is).