Why is the Webhook Event contact_center.queue_scheduled_callback_created not firing?

Recently, the Contact Center WebHook event, contact_center.queue_scheduled_callback_created, was subscribed to in the Marketplace App, but I have not seen the event ever post to our HTTPS endpoint. What are the specific conditions that have to be fulfilled for this event to fire? I’ve called queues and accepted a callback, but the event never posts.

I found this is the documentation, and it makes sense:

Scheduled Callbacks

Scheduled Callbacks enable your website visitors to schedule voice or video calls with your Contact Center. This feature works by establishing a connection between a Web Campaign and your Queue, without requiring a Flow configuration.

Will this be updated in the future to support callback webhook events for inbound calls? We really need this feature because there does not a way to get it from the engagements because the Contact Center API does not provide real-time data.