Error building Reactor execution graph when using switch with result template helper

[mitel]

Describe the bug
The code below fails to compile (after a mix clean). Error:

Step `:my_failing_step` depends on the result of a step named `:boo` which cannot be found

The execution graph cannot find a step outside the switch statement when using the result template helper.

To Reproduce

Reactor.run(SwitchReactor, %{value: "zen"})

defmodule SwitchReactor do
  @moduledoc false
  use Reactor

  input :value

  debug :debug do
    argument :value, input(:value)
  end

  step :moo do
    argument :value, input(:value)

    run fn %{value: value}, _ ->
      IO.puts IO.ANSI.format([:yellow_background, :black, "MOOO"])

      {:ok, value}
    end
  end

  step :boo do
    argument :value, result(:moo)

    wait_for :moo

    run fn %{value: value}, _ ->
      IO.puts IO.ANSI.format([:yellow_background, :black, "BOOO"])

      {:ok, value}
    end
  end

  switch :is_truthy? do
    on result(:boo)

    matches? &(&1 == "zen") do
      # step :falsy, Noop

      step :my_failing_step do
        argument :value, result(:boo)

        run fn %{value: value}, _ ->
          IO.puts IO.ANSI.format([:yellow_background, :black, value])

          {:ok, value}
        end
      end

      return :my_failing_step
    end

    default do
      step :anyways, Noop

      return :anyways
    end
  end

  return :is_truthy?
end

Expected behavior
The inner switch step should be able to use the result template helper.

Runtime

• Elixir version: 1.16.3
• Erlang version: 26
• OS: ubuntu-focal-20231003
• Spark version: 2.2.35
• reactor 0.10.1

Additional context
After multiple compilations at some point it started to work, but once I did a mix clean it failed again to compile.

[sbennett33]

Here's a simpler example that reproduces the same problem:

defmodule Level.Resources.ProvisionUser do
  @moduledoc """
  Provisions a user account.
  """
  use Ash.Reactor

  alias Level.Resources.OnboardingCode

  ash do
    default_domain Level
  end

  input :code

  read_one :onboarding_code, OnboardingCode, :by_code do
    inputs(%{code: input(:code)})
  end

  switch :has_code do
    on result(:onboarding_code)

    matches? &(not is_nil(&1)) do
      debug :debug do
        argument :onboarding_code, result(:onboarding_code)
      end
    end
  end

  return :onboarding_code
end

Generates the following error:

(Reactor.Error.Internal.PlanError) # Reactor Plan Error

An error occurred while building or updating the Reactor execution graph.

Step :debug depends on the result of a step named :onboarding_code which cannot be found

Step

%Reactor.Step{arguments: [%Reactor.Argument{name: :onboarding_code, source: %Reactor.Template.Result{name: :onboarding_code, sub_path: []}, transform: nil}], async?: true, context: %{}, impl: {Reactor.Step.Debug, [level: :debug]}, name: :debug, max_retries: 0, ref: :debug, transform: nil}

Graph

#Graph<type: directed, vertices: [%Reactor.Step{arguments: [%Reactor.Argument{name: :onboarding_code, source: %Reactor.Template.Result{name: :onboarding_code, sub_path: []}, transform: nil}], async?: true, context: %{}, impl: {Reactor.Step.Debug, [level: :debug]}, name: :debug, max_retries: 0, ref: :debug, transform: nil}], edges: []>

(spark 2.2.35) lib/spark/dsl/extension.ex:702: Spark.Dsl.Extension.raise_transformer_error/2
(elixir 1.17.2) lib/enum.ex:4858: Enumerable.List.reduce/3
(elixir 1.17.2) lib/enum.ex:2585: Enum.reduce_while/3
/Users/sbennett/Projects/src/github.com/Level-All/level/lib/level/resources/provision_user_2.ex:1: (file)
(stdlib 6.0.1) erl_eval.erl:904: :erl_eval.do_apply/7
(stdlib 6.0.1) erl_eval.erl:1192: :erl_eval.expr_list/7
(stdlib 6.0.1) erl_eval.erl:610: :erl_eval.expr/6