Still having issues with helper inheritance

I thought this was supposed to be fixed with #1665, but I am still having issues with it. I have a few classes inheriting from Grape::API and I want to avoid having to include the helpers in every endpoint class:

require "#{Rails.root}/app/api/v2/helpers/authentication_helper.rb"

module API
  module V2
    
    class Base < Grape::API
      prefix 'v2'
      format :json
    end
      
    class AuthenticatedBase < Base
       helpers ApiHelpers::AuthenticationHelper
       before { authenticate! }
    end
  
    class AdminBase < Base
      # other things in here for higher security routes
    end
    
  end
end

However, when I go to make my end point class inherit, I can't use the AuthenticationHelper methods like current_user, for example.

require "#{Rails.root}/app/api/v2/base_classes.rb"

module API
	module V2
		
		class Sensors < AuthenticatedBase

		  desc 'End-points for Sensors'
      
		  namespace :sensors do

...

Is this intended? What am I missing?

Start with app/api/v2/base_classes.rb and app/api/v2/helpers/authentication_helper.rb, then inspect the API::V2::Sensors entry point and reproduce access to current_user through AuthenticatedBase. Done means the intended inheritance behavior is established and the endpoint either receives the helper methods as expected or the missing behavior is clearly documented with coverage.