copy and paste have invalid tab completions

### WorldEdit Version

7.2.7-SNAPSHOT+5920-1173385

### Platform Version

git-Paper-228 (MC: 1.17.1)

### Confirmations

- [X] I am using the most recent Minecraft release.
- [X] I am not using a hybrid server, e.g. a server that combines Bukkit and Forge. Examples include Arclight, Mohist, and Cardboard.
- [X] I am using a version of WorldEdit compatible with my Minecraft version.
- [X] I am using the latest or recommended version of my platform software.

### Bug Description

The supported flags for copy are ebm, but tab completion makes them into something invalid:
The same applies to //paste too

### Expected Behavior

Have proper tab completion, like //set dirteee tab doesn't recommend random letters too.

### Reproduction Steps

1. Type //copy -e and now add random letters and tab complete them

### Anything Else?

_No response_