Attempting to use set! with a jbuilder value gives odd results about jbuilder HOT 2 CLOSED

json.(@booking, :api_data_schemas, :tickets_api_data_schemas)
json.seats @booking.seats do |seat|
  json.extract! seat, :id, :number_with_level, :bus_schedule_id, :seat_klass, :seat_klass_stars
  json.price seat.price.to_i
  json.price_usd seat.price_usd.to_f
end

{
  "is_a?": {},
  "api_data_schemas": {
    "outbound": {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "object",
      "properties": {
        "departure_bus_stop": {
          "title": "Subida",
          "type": "integer",
          "values": [
            {
              "title": "TERMINAL SUR",
              "value": 1
            },
            {
              "title": "Cruce Colón",
              "value": 8
            }
          ]
        },
        "destination_bus_stop": {
          "title": "Bajada",
          "type": "integer",
          "values": [
            {
              "title": "TERMINAL OSORNO",
              "value": 5
            },
            {
              "title": "Cruce Los Tambores",
              "value": 29
            }
          ]
        }
      },
      "required": [
        "departure_bus_stop",
        "destination_bus_stop"
      ]
    }
  },
  "tickets_api_data_schemas": {},
  "seats": [
    {
      "is_a?": {},
      "id": 375,
      "number_with_level": "1-4",
      "bus_schedule_id": 417,
      "seat_klass": "2",
      "seat_klass_stars": 2,
      "price": 25000,
      "price_usd": 40.95
    }
  ]