Association model errors on not reflecting on form object

[Dhamsoft]

Data Setup

    Customer.delete_all
    House.delete_all
    @vendor = Customer.create!(name: "Test User", email: "[email protected]", phone_number: "123-4567")
    @house = House.create!(:vendor => @vendor, :street_number => "8/90", :street_name => "Main Street", :city => "Townsville")
    @rooms = [
      @house.house_rooms.create!(:name => "Bedroom", :area => 20),
      @house.house_rooms.create!(:name => "Bathroom", :area => 16),
    ]
    @room_listing_form = RoomListingForm.new(@house)

Code for reproducing the case

   @room_listing_form.update!(:city => "Fancyville", :rooms_attributes => { @rooms.first.id.to_s => { "id" => @rooms.first.id.to_s, "room_name" => "", :area => 9 }}) recue ActiveRecord::RecordInvalid

   @room_listing_form.valid? # true
   @room_listing_form.rooms.first.valid? # false
   @room_listing_form.errors.full_messages # []
   @room_listing_form.rooms.first.errors.full_messages # ["Room name can't be blank"]

[Dhamsoft]

Test coverage added #3