MailParser simpleparser parses out "Forwarded message" section when decoding base64

[lydiastepanek]

On a recent email I was processing, I noticed that simpleParser removes the "---------- Forwarded message ---------" part of the email it parses, so that EmailForwardParser can't find the forwarded email within:

import { simpleParser } from "mailparser";
import EmailForwardParser from "email-forward-parser";

const parentEmail = await simpleParser(s3Object);
let forwardedEmail;
if (parentEmail.text) {
  forwardedEmail = new EmailForwardParser().read(parentEmail.text);
}
// forwardedEmail.forwarded is false when it should be true

[^ Code link: https://github.com/lydiastepanek/is-this-phishy/blob/9eb69c0f22d5bbacde08738bb9c39032798d614c/index.js#L30-L34 ]

Here's the email I was processing (s3Object above): https://gist.github.com/lydiastepanek/10c78098b763c60bae2b4308fd034323

Is this intentional behavior? Is there an option I can pass into simpleParser to keep the "---------- Forwarded message ---------" section of the email intact after getting parsed?