After Creating a Jira Webhook, Atlassian Doesn't Sent Webhooks Right Away

My app registers a webhook using Atlassian’s webhook APIs. I expect to start receiving webhooks right away, but it takes 1-24h before it works. If I query for registered webhooks I see the one I just created, but it doesn’t work for a while.

Once I do start receiving webhooks it works consistently. This delay isn’t documented anywhere. Is this a bug or expected behavior? How can I avoid this delay?

Webhooks Via UI:

Webhooks created via the UI work immediately (https://<subdomain>

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