axe.utils.querSelectorAll() fails to ID query a slotted light dom node

The following shouldn't return an empty array:

```html

Light content

const root = axe.setup()
axe.utils.querySelectorAll('#target') // Should not be empty

```

I don't think this can impact how axe-core runs, as we never user ID queries in rules. But its a bit of an annoyance when writing tests.