Surprising fraction of behavior

Looking for some clarification on the types used in this code snippet:

interface UserDTO {
  id: string;
  email: string;
}

const input: Partial<UserDTO> = {};
const userDTO: Partial<UserDTO> = { id: "", ...input };

const email = userDTO.email;

I was expecting the email variable to be of type string | undefined, but it seems to be just string. What could be causing this discrepancy?

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