ScrollItem doesn't emit `change` event

[foundryspatial-duncan]

The API docs say that the ScrollItem component emits a change event, but I don't see anything in the code that emits this event.

With this markup:

<scroll-item id="section-8" @change="itemScrolled">
    <p id="section-8" class="content-item">Deserunt architecto modi possimus ...</p>
</scroll-item>

<scroll-item id="section-9" @change="itemScrolled">
    <p id="section-9" class="content-item">Facilis culpa possimus natus eveniet,... </p>
</scroll-item>

The itemScrolled method is never called. I'm using Vue 2.6.6