"This deployment failed" with no further information - why did my deployment fail?

I am using Workers & Pages. Deployments have stopped working. When I run wrangler pages deploy, it finishes with "Deployment complete!", but when I visit the deployment in the dashboard, a tooltip shows "This deployment failed". I have hunted EVERYWHERE in the UI for any further information, but where is it? How do I debug "This deployment failed"?

My deployment id: 2aef1fb7-032a-40c9-8a72-571a801d952e
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