workers.api.errors.tail_worker_not_found

When I attempt to PUT /accounts/$ACCOUNT_ID/workers/scripts/$SCRIPT_NAME , I observe the following error:

{"result":null,"success":false,"errors":[{"code":10203,"message":"workers.api.error.tail_worker_not_found"}],"messages":[]}   at workers.api.error.tail_worker_not_found (cloudflare:10203) at ...


I searched for variations of this string and code and I cannot find any documentation on this error online. Does anyone know what's going wrong?
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