Controller concern constant not being loaded by model concern in production

Question

Legacy rails app that's been upgraded to v6.0.5.1 - Zeitwerk enabled

I have a controller concern. I.e.

# /app/controllers/concerns/example.rb
module Example
  extend ActiveSupport::Concern
  CONSTANT = [1, 2, 3].freeze
end

and a model concern that works as followers

# /app/models/concerns/model/exampleable.rb
module Model::Exampleable
  extend ActiveSupport::Concern
    BUILD_ENUM = -> (arr) { arr.each_with_object({}).with_index { |(el, accu), index| accu.merge!({ el.to_sym => index }) } }.freeze

  included do
    enum random_enum: BUILD_ENUM[Example::CONSTANT]
  end
end

in my application.rb

    config.eager_load_paths += %W[
      #{config.root}/app/models/concerns
      #{config.root}/app/controllers/concerns
    ]

Everything works fine in development + testing. I've read over the Rails 6 Autoloading docs a few times. I cannot figure out what rules I am violating and why it is unable to find the other module. The error I am getting is:

app/models/concerns/model/exampleable.rb:8:in `block in <module:Exampleable>': uninitialized constant Example::CONSTANT (NameError)