let?() method not working when assignment is not in the final context

[ptrela]

When let(:year) is inside context1, assertion can't find its value (2021).
When we move it to the context2 - it will work.

# frozen_string_literal: true

require 'spec_helper'

describe Cars::ModelService do
  subject(:service) { described_class.call(**parameters) }

  let(:parameters) { { year: let?(:year, nil) } }

  context 'context1' do
    let(:year) { '2021' }

    context 'context2' do
      it 'returns array with one object' do
        expect(service.car_list.count).to eq 1
      end
    end
  end
end