Ruby on Rails

Hi,
I can't seem to find anything on the web regarding this error I found. I don't know if it's something i did wrong or just some kind of bug.

I have 2 engines, named "Pes" and "Iss". "Pes" is the most atomic engine in our project and all other engines will add it as a dependency, it has these models:

Pes::Person
Pes::Person::Phone

The "Iss" engine depends on "Pes" and has these models that inherits from "Pes"

Iss::Person < Pes::Person
Iss::Person::Phone < Pes::Person::Phone

My problem is that, when I call Iss::Person.new, rails gives me an Iss::Person object... Great! But when I call Iss::Person::Phone, rails is giving me a Pes::Person::Phone object... I tried everything, and even when i remove the inheritance from the Iss::Person::Phone model, it still gives me the Pes::Person::Phone object.

Here's some sample code:

module Pes
  class Person < ApplicationRecord

     ...

  end
end

module Iss
  class Person::Phone < Pes::Person::Phone

     ...

  end
end

I'm using rails 4.2.9, but i tried to update to 5.0.2 and it still giving me this bug, I still haven't tried using rails >= 5.1

Also, sorry if my english doesn't make much sense, i'm from Brasil