Attribute on root element isn't working

```javascript
 return html`
        <dialog ${state.value.isCategoriesModalOpen ? "open" : ""}>
            <div class="vertical">
```

this will throw an error like:
```
@dobschal_html__js.js?v=c94d6668:244 Uncaught Error: Fatal: Could not find placeholder for argument: 0
    at default (CategoriesModal.ts:17:12)
    at default (Layout.ts:37:11)
    at main.ts:24:16

```