QueryBuilder results not grouping in array

Hello all,

Why is this:

$surcharges = $this->modelsManager->createBuilder()
    ->columns(['surcharge.*', 'company.*', 'match.*'])
    ->addFrom('Tariff\\Surcharge', 'surcharge')
    ->leftJoin('\\Company', 'surcharge.company_id = company.id', 'company')
    ->leftJoin('Tariff\\SurchargeMatch', 'surcharge.tariff_surcharge_match_id = match.id', 'match')
    ->where(join(' AND ', $where), $bind)
    ->limit($limit, $start)
    ->getQuery()
    ->execute();

echo json_encode($surcharges->toArray());

returning this:

[{
    "surcharge": {
        "id": "407b3096-e706-1a2f-a0b4-67e4a4d0eb14",
        "name": "Cash-on-delivery",
        "company_id": null,
        ...
    },
    "company": {
        "id": null,
        "account_no": null,
        "pickup_address_no": null,
        "name": null,
        ...
    },
    "match": {
        "id": "5c9c20c0-9ed2-ee5d-ebd4-b45e14a0b3e0",
        "name": "Cash-on-delivery",
        "code": "B",
        "text": "",
        ...
    }
}]

However, when I use single columns:

->columns(['surcharge.*', 'company.name', 'company.id', 'match.code', 'match.text', 'match.id'])

It doesn't group the table results:

  [{
      "surcharge": {
      "id": "407b3096-e706-1a2f-a0b4-67e4a4d0eb14",
      "name": "Cash-on-delivery",
      "company_id": null,
      "country_code": "NL",
      "amount": 20,
      "percent": 0,
      "description": "",
      ...
      },
      "name": null,
      "id": "5c9c20c0-9ed2-ee5d-ebd4-b45e14a0b3e0",
      "code": "B",
      "text": ""
  }]

I think this is unwanted behavior, or is there some argument that I'm missing?

Greets, Tim