exists? with default_scope error (AR >= 2.3.9)

exists_with_scope.log

# Logfile created on Wed Oct 13 11:50:35 -0500 2010 by logger.rb/22285
  SQL (0.3ms)   select sqlite_version(*)
  SQL (0.5ms)   CREATE TABLE "widgets" ("id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, "accessory_id" integer) 
  SQL (0.1ms)   CREATE TABLE "accessories" ("id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL) 
  Accessory Create (0.1ms)   INSERT INTO accessories VALUES(NULL)
  Widget Create (0.1ms)   INSERT INTO "widgets" ("accessory_id") VALUES(1)
  Widget Load (0.1ms)   SELECT "widgets".id FROM "widgets" WHERE ("widgets"."accessory_id" = 1) LIMIT 1

exists_with_scope.rb

gem 'activerecord', '2.3.9'

require 'active_record'
require 'pp'

ActiveRecord::Base.logger = Logger.new('exists_with_scope.log')
ActiveRecord::Base.establish_connection(:adapter => 'sqlite3', :database => ':memory:')

ActiveRecord::Base.connection.create_table :widgets do |t|
  t.references :accessory
end

ActiveRecord::Base.connection.create_table :accessories do |t|
end

class Widget < ActiveRecord::Base
  belongs_to :accessory

  default_scope :include => :accessory
end

class Accessory < ActiveRecord::Base
end

a1 = Accessory.create

Widget.create(:accessory_id => a1.id)

pp Widget.columns.map(&:name)

puts Widget.exists?(:accessory_id => a1)  # should print "true"

output

["id", "accessory_id"]
/Users/davidyip/.rvm/gems/ruby-1.8.7-p302/gems/activerecord-2.3.9/lib/active_record/association_preload.rb:320:in `send': missing attribute: accessory_id (ActiveRecord::MissingAttributeError)
	from /Users/davidyip/.rvm/gems/ruby-1.8.7-p302/gems/activerecord-2.3.9/lib/active_record/association_preload.rb:320:in `preload_belongs_to_association'
	from /Users/davidyip/.rvm/gems/ruby-1.8.7-p302/gems/activerecord-2.3.9/lib/active_record/association_preload.rb:319:in `each'
	from /Users/davidyip/.rvm/gems/ruby-1.8.7-p302/gems/activerecord-2.3.9/lib/active_record/association_preload.rb:319:in `preload_belongs_to_association'
	from /Users/davidyip/.rvm/gems/ruby-1.8.7-p302/gems/activerecord-2.3.9/lib/active_record/association_preload.rb:120:in `send'
	from /Users/davidyip/.rvm/gems/ruby-1.8.7-p302/gems/activerecord-2.3.9/lib/active_record/association_preload.rb:120:in `preload_one_association'
	from /Users/davidyip/.rvm/gems/ruby-1.8.7-p302/gems/activesupport-2.3.9/lib/active_support/ordered_hash.rb:115:in `each'
	from /Users/davidyip/.rvm/gems/ruby-1.8.7-p302/gems/activesupport-2.3.9/lib/active_support/ordered_hash.rb:115:in `each'
	from /Users/davidyip/.rvm/gems/ruby-1.8.7-p302/gems/activerecord-2.3.9/lib/active_record/association_preload.rb:114:in `preload_one_association'
	from /Users/davidyip/.rvm/gems/ruby-1.8.7-p302/gems/activerecord-2.3.9/lib/active_record/association_preload.rb:91:in `preload_associations'
	from /Users/davidyip/.rvm/gems/ruby-1.8.7-p302/gems/activerecord-2.3.9/lib/active_record/association_preload.rb:90:in `preload_associations'
	from /Users/davidyip/.rvm/gems/ruby-1.8.7-p302/gems/activerecord-2.3.9/lib/active_record/association_preload.rb:90:in `each'
	from /Users/davidyip/.rvm/gems/ruby-1.8.7-p302/gems/activerecord-2.3.9/lib/active_record/association_preload.rb:90:in `preload_associations'
	from /Users/davidyip/.rvm/gems/ruby-1.8.7-p302/gems/activerecord-2.3.9/lib/active_record/base.rb:1584:in `find_every'
	from /Users/davidyip/.rvm/gems/ruby-1.8.7-p302/gems/activerecord-2.3.9/lib/active_record/base.rb:1539:in `find_initial'
	from /Users/davidyip/.rvm/gems/ruby-1.8.7-p302/gems/activerecord-2.3.9/lib/active_record/base.rb:696:in `exists?'
	from exists_with_scope.rb:30