When creating a space, label isn't added all the time

v7.1.3

```
[I] ➜ yabai -m space --create 2 --label hello
[I] ➜ yabai -m space --create 2 --label hell5
[I] ➜ yabai -m space --create 2 --label hellg
[I] ➜ yabai -m space --create 2 --label hella
[I] ➜ yabai -m query --spaces label
[{
"label":"notes"
},{
"label":"something"
},{
"label":""
},{
"label":""
},{
"label":""
},{
"label":""
},{
"label":""
},{
"label":""
},{
"label":""
},{
"label":""
},{
"label":"hella"
},{
"label":""
},{
"label":""
},{
"label":""
},{
"label":""
},{
"label":""
}]
[I] ➜ yabai
```

Start by reproducing the issue with the `yabai -m space --create 2 --label` commands shown, then query spaces with `yabai -m query --spaces label`. Trace the space-creation command and label assignment path; done means every newly created space consistently reports the requested label instead of an empty label.

Written by the indexing model from the issue text.