check() no working with checkbox groups

Hello,

I have been trying to use the PhoenixTest library with multiselect checkboxes (those that share the same `name <> "[]"`). 

Problem: PhoenixTest crashes, searching for hidden inputs. Example:

<img width="322" height="486" alt="Image" src="https://github.com/user-attachments/assets/eba13ca9-f271-41d3-a050-ccf192184ade" />

what fails:

```elixir
   uncheck(conn, "Zoom")
```