Timeout Error (1253) When Registering Worker-Generated HTML as Custom Error Asset

"When I try to register the HTML generated by my Worker as a custom error asset (via PUT /custom_pages/assets/), I am getting the following error:

{code: 1253, message: "Error fetching asset: Timeout fetching: h\ttps://my-worker.com/error/page"}

Is it possible that this is caused by the loading of the beacon.min.js script? This operation was working successfully just a few days ago.

Have any new restrictions been implemented, or is this a known issue?"
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