ref.push() not resolving if ref.set() used separately

[Redmega]

I have the following function written with .push() followed by .set() separately because I need to duplicate my id into the document for legacy reasons.

async createItemInCategory(category, data) {
  const ref = await this.db.ref(`categories/${category}`).push()

  const item = {
    ...data,
    id: ref.key,
    created: Date.now(),
    updated: Date.now()
  }

  await ref.set(item)

  return item
}

When testing this function, it never resolves, causing jest to timeout.

I haven't had the chance to test it if used in tandem, to see if .push().set() works, but in this particular case I would need to make two firebase calls to accommodate having id in the document, when the code, unchanged, works as expected with an actual firebase instance.