Error message path for rule with nested params reproducing bug

errors.en.yml

en:
  dry_validation:
    errors:
      rules:
        data:
          attributes:
            phone_number:
              invalid_format: 'is of invalid format'

test.rb

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'rspec'
  gem 'i18n', '~> 1.6', require: false
  gem 'dry-validation', '~> 1.6', require: false
end

require 'rspec/autorun'
require 'i18n'
require 'dry-validation'

RSpec.describe 'Error message path for rule with nested params ' do
  let(:contract) do
    Dry::Validation::Contract.build do
      config.messages.backend = :i18n
      config.messages.load_paths << Pathname(__dir__).join('errors.en.yml').realpath

      params do
        optional(:data).hash do
          required(:attributes).hash do
            required(:phone_number).maybe(:string)
          end
        end
      end

      rule('data.attributes.phone_number') do
        key.failure(:invalid_format) unless value == "123"
      end
    end
  end

  it 'works with deep nested rules' do
    expect(contract.call(data: {attributes: {phone_number: '321'}}).errors.to_h).to eq(data: {attributes: {phone_number: ['is of invalid format']}})
  end
end