EmberJS - Can't find NPM package in 'registry' when vendor loader looks for modules

I have been running an EmberJS app and I just installed a new package using Yarn graphql@0.13.0. For sanity, I checked my package.json file and it is in there. Also when I run yarn list --depth=0, I can see that the package was successfully installed.

├─ graphql-tag@2.10.1
├─ graphql-tools@2.24.0
├─ graphql@0.13.0

I start my Ember app and I get this error straight away.

Uncaught Error: Could not find module graphql imported from `ember-cli-mirage-graphql/related-records

I checked ember-cli-mirage-graphql to see if it was a dependency version issue, but the graphql dependency of ember-cli-mirage-graphql is 0.13.0. I went into the stack trace where the exception is happening, to debug the issue at /assets/vendor/loader/loader.js. There is a function that takes a dependency name, in this case I could see it was 'graphql', and uses that as a key to a registry dictionary to find and load the package. I looked into the registry and could see that a lot of other packages I expected to find were in fact there and it was only that package that was missing.

function missingModule(id, referrer) {
    throw new Error('Could not find module `' + id + '` imported from `' + referrer + '`');
  }

  function findModule(id, referrer, pending) {
    var mod = registry[id] || registry[id + '/index'];

    while (mod && mod.isAlias) {
      mod = registry[mod.id] || registry[mod.id + '/index'];
    }

    if (!mod) {
      missingModule(id, referrer);
    }

    if (pending && mod.state !== 'pending' && mod.state !== 'finalized') {
      mod.findDeps(pending);
      pending.push(mod);
    }
    return mod;
  }

I looked online, but couldn't find anything helpful. What registry is this and why isn't it updated with the new package I installed? Is there a way I can reset the registry?