Style/ClassAndModuleChildren with compact style should not be enforced when top level class is a subclass

[morgoth]

Having .rubocop.yml

Style/ClassAndModuleChildren:
  EnforcedStyle: compact

and test.rb

class ApplicationJob < String
  class Error
  end
end

When I run rubocop --only Style/ClassAndModuleChildren
I get

test.rb:1:7: C: Use compact module/class definition instead of nested style.
class ApplicationJob < String

but when I change test.rb to:

class ApplicationJob < String
  class Error
  end

  def test
  end
end

it passes fine

Expected behavior

I think it should not enforce compact style in case when top level class is a subclass.

RuboCop version

rubocop -V
0.37.2 (using Parser 2.3.0.6, running on ruby 2.3.0 x86_64-linux)