Mongoid related scopes in inherited models - fails in RC1

gistfile1.txt

class Business
  include Mongoid::Document
  references_many :cleanliness_ratings
  ...
end

class Rating
  include Mongoid::Document
  referenced_in :business
  scope :good, :where => {:score.gte => 7}
end

class CleanlinessRating < Rating
end

# In Mongoid 2.0.0.beta.20

business.cleanliness_ratings.good

#=> #<Mongoid::Criteria:0x000001051da6b8 @selector={"business_id"=>BSON::ObjectId4cd8277444939b0592003d70, :score=>{"$gte"=>7}}, options{}, klassCleanlinessRating, documents[]

# In Mongoid 2.0.0.rc.1

NoMethodError: undefined method `conditions' for nil:NilClass
	from /Users/scott/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.3/lib/active_support/whiny_nil.rb:48:in `method_missing'
	from (eval):3:in `good'
	from /Users/scott/.rvm/gems/ruby-1.9.2-p0/gems/mongoid-2.0.0.rc.7/lib/mongoid/criteria.rb:181:in `block in method_missing'
	from /Users/scott/.rvm/gems/ruby-1.9.2-p0/gems/mongoid-2.0.0.rc.7/lib/mongoid/finders.rb:167:in `with_scope'
	from /Users/scott/.rvm/gems/ruby-1.9.2-p0/gems/mongoid-2.0.0.rc.7/lib/mongoid/criteria.rb:180:in `method_missing'
	from /Users/scott/.rvm/gems/ruby-1.9.2-p0/gems/mongoid-2.0.0.rc.7/lib/mongoid/relations/referenced/many.rb:308:in `block in method_missing'
	from /Users/scott/.rvm/gems/ruby-1.9.2-p0/gems/mongoid-2.0.0.rc.7/lib/mongoid/finders.rb:167:in `with_scope'
	from /Users/scott/.rvm/gems/ruby-1.9.2-p0/gems/mongoid-2.0.0.rc.7/lib/mongoid/relations/referenced/many.rb:307:in `method_missing'
	from (irb):19
	from /Users/scott/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/commands/console.rb:44:in `start'
	from /Users/scott/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/commands/console.rb:8:in `start'
	from /Users/scott/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/commands.rb:23:in `<top (required)>'
	from script/rails:9:in `require'
	from script/rails:9:in `<main>'