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Fixes #1547 🦕

Note: If you are opening a pull request against a legacy branch, PLEASE BE AWARE that we generally won't accept these except for things like important security fixes, and only for a limited time.

I'm not sure why .then() was added here, it appears to be redundant. But without chaining it will cause an unhandled exception; which is causing #1547.

Here's an example of an uncaught exception being thrown when chaining isn't used:

const promise = new Promise((resolve, reject) => {
    reject();
});

promise.then(() => console.log('resolved'));
promise.catch(e => console.error('rejected'));

rejected
node:internal/process/promises:288
            triggerUncaughtException(err, true /* fromPromise */);
            ^

[UnhandledPromiseRejection: This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason "undefined".] {
  code: 'ERR_UNHANDLED_REJECTION'
}