Original email is not repliable

Hey folks, I’m trying to reply to emails using the Email Worker, and the basic use case is working if the worker receives a direct email, although it fails to reply to Forwarded email, with the message:

original email is not replicable

I couldn’t find any reference to that message anywhere. Doesn’t anyone know what could it be? the code is just the provided example. https://developers.cloudflare.com/email-routing/email-workers/reply-email-workers/

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Fixing typo in the message.

original email is not repliable