For ExpoAR Image Detection, in the listener onAnchorsDidUpdate(), when is the event type `AR.AnchorEventType.Remove` supposed to happen?

Expo SDK
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In Expo AR (currently iOS only), for image detecting, when the image is first detected, the eventType AR.AnchorEventType.Add is fired.

When the image moves relative to the camera, the eventType AR.AnchorEventType.Update is fired.

When is AR.AnchorEventType.Remove meant to fire? I thought it might fire when the image is no longer in view of the camera, but this isn’t the case. So when does it fire? (and separate question really - how can i detect when an image is no longer in view?)

Thanks

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