GroupBy On OneToMany Relationship (Laravel 5.8)

I have the following chunk of code which returns data successfully:

ProductAttributeKey::withAndWhereHas('product_attribute_values', function($query) use ($organization_id, $country_id) {
    $query->whereHas('product', function ($query) use ($organization_id, $country_id) {
        $query->whereHas('organization_price_matrix', function ($query) use ($organization_id, $country_id) {
            $query->where('organization_id', $organization_id)
                ->where('product_cost_matrix.country_id', $country_id);
       });
   }); /* Tested Here: ->grouBy("name") */
})
->orderBy($order_by, $sort_by)
->paginate($per_page)

The data comes back in the following format when returned in a resource:

I want to group by the attribute "name" in the array "product_attribute_values".

I have tested groupBy name as you can see in the code block at the top. This seems works fine when the array for "product_attribute_values" contains more than one value, but if it contains one value it seems to remove it.

With groupBy("name"):

As you can see, it works fine for the first value "Alcohol Volume", but on the next value, "Batteries Included", it removes the only value in the array "product_attribute_values". I don't want it to remove that single value.

How would this be fixed?

via Chebli Mohamed