[EventBridge] No schemas in the Discovered Schema Registry

When navigating to the Discovered Schema Registry in the EventBridge console, I am met with two alerts (pasted below).

1. "Start schema discovery: You must enable discovery on an event bus to automatically generate schemas for events on that bus. To enable discovery, go to Event buses. Newly discovered schemas will appear in this registry."
2. "There is no schema in this registry. It could take several minutes for schemas to appear once discovery has been enabled."

I enabled Discovery on my default event bus yesterday afternoon. I know that events are being published to the default bus, as I created an archive at that time which has grown to ~50 MB in size after processing 34k+ events. Why are none of these events showing up in my Discovered Schema Registry?

Discovered Schema Registry with no schemas

Default event bus with discovery enabled

Event archive started yesterday afternoon populated with events