I heard back from Cloudflare Support: they say the issue is resolved, but didn’t provide any information about what the issue was or how it was resolved.
We appreciate your patience regarding this case.
Our Engineering team has notified us that this issue should now be resolved.
Can you please confirm on your end and let us know if you need further assistance?
Technical Support Engineer | Cloudflare
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I encouraged the support team to weigh in on this thread so that we have clarity about what was going wrong, what was fixed, and whether any action is required on our parts to avoid this issue in the future.