Given the code:

class A
  class << self
    private

    def foo
    end
  end

  def bar
    baz.bar
  end
end

Rails/Delegate doesn't produce an offence for def bar. Removing the private on line 3 however correctly triggers the cop. Note that the bar method itself is not private.

Expected behavior

An offence for the delegation. Inner classes' private declarations should be ignored when checking whether this is a private delegation. Note that this also would be ignored while it should not:

class A
  class B
    private

    def foo
    end
  end

  def bar
    baz.bar
  end
end

Actual behavior

no offences detected

Steps to reproduce the problem

This is extremely important! Providing us with a reliable way to reproduce
a problem will expedite its solution.

RuboCop version

Include the output of rubocop -V or bundle exec rubocop -V if using Bundler. Here's an example:
You can see extension cop versions (e.g. rubocop-rails, rubocop-performance, and others) output by rubocop -V,
include them as well. Here's an example:

$ [bundle exec] rubocop -V
rubocop -V
1.30.1 (using Parser 3.1.2.0, rubocop-ast 1.18.0, running on ruby 3.1.2 arm64-darwin21)
  - rubocop-performance 1.14.1
  - rubocop-rails 2.14.2
  - rubocop-rake 0.6.0
  - rubocop-rspec 2.11.1