Fixed here: https://github.com/mongodb/mongoid/pull/4504

Given you have the following relations:

class Person
  include Mongoid::Document
  embeds_one :name
end

class Name
  include Mongoid::Document
  embeds_many :translations
end

class Translation
  include Mongoid::Document
  embedded_in :name
end

If you try to clone the `person`, you get the following error:

Person.new(name: Name.new(translations: [Translation.new])).clone

{{NoMethodError: undefined method `translations' for #<Person _id: 5b364ccba64769539ad9b0c4, > }}
from mongoid/lib/mongoid/copyable.rb:77:in `block (2 levels) in process_localized_attributes