2 errors: Cannot find module 'abortcontroller-polyfill...' and Cannot read property 'source' of undefined

[Unkrass]

After updating to Ember octane our build process in the deployment pipeline fails with the error Error: Cannot find module 'abortcontroller-polyfill/dist/cjs-ponyfill' and when I try to reproduce the error locally (because I saw this), I get another error when building with ember build --environment production, saying:

broccoliBuilderErrorStack: TypeError: Cannot read property 'source' of undefined
  - code: [undefined]
  - codeFrame: Cannot read property 'source' of undefined
  - errorMessage: Cannot read property 'source' of undefined
        at FastBootConfig (Generate: FastBoot package.json)

I used the following packages:

    "ember-cli": "~3.21.2",
    "ember-cli-fastboot": "^2.2.3",
    "ember-fetch": "^8.1.0",

Has anyone seen this before and knows what to do?

[Unkrass]

we added a yarn inside the dist folder to fix the abortcontroller error and updated a fastboot-app-server dependency that's inside another package.json. everything works fine now.