"outcome": "canceled"

This error is typically caused by the client (browser) side of the connection closing it, and doesn't usually indicate a problem on Cloudflare's side. And looking into code 1006 further, it seems this is an error code non-specific to Cloudflare and indicates an abnormal connection close on the end of the client. For example there are general internet resources like https://stackoverflow.com/a/19305172 which describe this.