5.8.0 header.subtitle failed due to header being undefined in Playlist constructor

[PikachuEXE]

Steps to reproduce

• Save following script into a file e.g. script.js
• Install youtube.js (I did this in FreeTube project folder)
• node script.js

const { Innertube } = require('youtubei.js')

async function createInnertube(options = { withPlayer: false, location: undefined, safetyMode: false, clientType: undefined, generateSessionLocally: true }) {
  return await Innertube.create({
    enable_safety_mode: false,
    generate_session_locally: !!options.generateSessionLocally
  })
}

(async () => {
  const innertube = await createInnertube()
  let playlist = await innertube.getPlaylist('PLKkxnBwFOJGKYQo3EGYjE4FhJUbBq_2U5')

  const videos = playlist.items

  while (playlist.has_continuation) {
    playlist = await playlist.getContinuation()

    videos.push(...playlist.items)
  }

  console.info('Done!', videos.length)
})()

Original steps for FT dev

• Checkout latest development branch of https://github.com/FreeTubeApp/FreeTube (072066fbe1384ab09bdb1a3eca5f8e78d1cdb2ad at the time of writing)
• yarn && yarn dev
• Paste https://www.youtube.com/watch?v=Rm9PJNF3sE0&list=PLKkxnBwFOJGKYQo3EGYjE4FhJUbBq_2U5 to top, press enter or the arrow button

Failure Logs

See Current behavior

Expected behavior

No error thrown

Current behavior

Version

Default

Anything else?

Using node 18.6.1 not 18.7.0 due to https://github.com/nodejs/node/issues/48855

Checklist

• I am running the latest version.
• I checked the documentation and found no answer.
• I have searched the existing issues and made sure this is not a duplicate.
• I have provided sufficient information.