I’ll bet your zwave Item has further options in the metadata (placed there by the binding).
If you do want to display state, you can ask explicitly ... label="some text [%s]" ...
or if you want to suppress it, you can do that too ... label="some text []" ...
When a binding supplies hints for how to display an Item I don’t think those hints actually get saved to the metadata database. So you wouldn’t find it there. But in Basic UI at least defining the label, either on the Sitemap or the Site Description metadata should give you back control over the appearance. I think there is an issue for MainUI though where the binding supplied hints override those you define.
It’s special metadata you can set on any Item and it largely replaces defining the [ ] in the label everywhere except for sitemaps.
To suppress the state from being printed you would set the Pattern to a space (or open the code tab and set it to the empty String.
As you can see, you can provide a lot more than just the label config including being able to define a Map transform right there on the Item instead of needing a separate .map file (which is a good choice if there is only one Item that needs a given map).