I would check https://www.peeringdb.com/asn/13335

When the client disconnects, all tasks associated with that client request are canceled. Use event.waitUntil() to delay cancellation for another 30 seconds or until the promise passed to waitUntil() completes.

Cloudflare updates the Workers runtime a few times per week. When this happens, any in-flight requests are given a grace period of 30 seconds to finish. If a request does not finish within this time, it is terminated.