diff --git a/.formatter.exs b/.formatter.exs
index 9a0dfe2..37a39a9 100644
--- a/.formatter.exs
+++ b/.formatter.exs
@@ -22,8 +22,10 @@ spark_locals_without_parens = [
   default: 1,
   flunk: 2,
   flunk: 3,
+  fun: 1,
   group: 1,
   group: 2,
+  impl: 1,
   input: 1,
   input: 2,
   level: 1,
diff --git a/.github/workflows/elixir.yml b/.github/workflows/elixir.yml
index a12a58f..ad3a8d4 100644
--- a/.github/workflows/elixir.yml
+++ b/.github/workflows/elixir.yml
@@ -15,3 +15,4 @@ jobs:
     with:
       spark-formatter: true
       postgres: false
+      igniter-upgrade: false
diff --git a/lib/reactor/dsl/switch.ex b/lib/reactor/dsl/switch.ex
index a662d41..80f76fd 100644
--- a/lib/reactor/dsl/switch.ex
+++ b/lib/reactor/dsl/switch.ex
@@ -128,8 +128,10 @@ defmodule Reactor.Dsl.Switch do
     alias Spark.{Dsl.Verifier, Error.DslError}
 
     def build(switch, reactor) do
-      with {:ok, matches} <- build_matches(switch, reactor),
-           {:ok, default} <- build_default(switch, reactor) do
+      sub_reactor = Builder.new(reactor.id)
+
+      with {:ok, matches} <- build_matches(switch, sub_reactor),
+           {:ok, default} <- build_default(switch, sub_reactor) do
         Builder.add_step(
           reactor,
           switch.name,
diff --git a/mix.lock b/mix.lock
index e6bb512..be8767b 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,6 +1,5 @@
 %{
   "bunt": {:hex, :bunt, "1.0.0", "081c2c665f086849e6d57900292b3a161727ab40431219529f13c4ddcf3e7a44", [:mix], [], "hexpm", "dc5f86aa08a5f6fa6b8096f0735c4e76d54ae5c9fa2c143e5a1fc7c1cd9bb6b5"},
-  "castore": {:hex, :castore, "1.0.8", "dedcf20ea746694647f883590b82d9e96014057aff1d44d03ec90f36a5c0dc6e", [:mix], [], "hexpm", "0b2b66d2ee742cb1d9cb8c8be3b43c3a70ee8651f37b75a8b982e036752983f1"},
   "credo": {:hex, :credo, "1.7.7", "771445037228f763f9b2afd612b6aa2fd8e28432a95dbbc60d8e03ce71ba4446", [:mix], [{:bunt, "~> 0.2.1 or ~> 1.0", [hex: :bunt, repo: "hexpm", optional: false]}, {:file_system, "~> 0.2 or ~> 1.0", [hex: :file_system, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "8bc87496c9aaacdc3f90f01b7b0582467b69b4bd2441fe8aae3109d843cc2f2e"},
   "decimal": {:hex, :decimal, "2.1.1", "5611dca5d4b2c3dd497dec8f68751f1f1a54755e8ed2a966c2633cf885973ad6", [:mix], [], "hexpm", "53cfe5f497ed0e7771ae1a475575603d77425099ba5faef9394932b35020ffcc"},
   "dialyxir": {:hex, :dialyxir, "1.4.3", "edd0124f358f0b9e95bfe53a9fcf806d615d8f838e2202a9f430d59566b6b53b", [:mix], [{:erlex, ">= 0.2.6", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm", "bf2cfb75cd5c5006bec30141b131663299c661a864ec7fbbc72dfa557487a986"},
@@ -10,11 +9,9 @@
   "ex_check": {:hex, :ex_check, "0.16.0", "07615bef493c5b8d12d5119de3914274277299c6483989e52b0f6b8358a26b5f", [:mix], [], "hexpm", "4d809b72a18d405514dda4809257d8e665ae7cf37a7aee3be6b74a34dec310f5"},
   "ex_doc": {:git, "https://github.com/elixir-lang/ex_doc.git", "453199337dc605a3eafc7a41e3909fd6ec0656e9", []},
   "file_system": {:hex, :file_system, "1.0.0", "b689cc7dcee665f774de94b5a832e578bd7963c8e637ef940cd44327db7de2cd", [:mix], [], "hexpm", "6752092d66aec5a10e662aefeed8ddb9531d79db0bc145bb8c40325ca1d8536d"},
-  "finch": {:hex, :finch, "0.18.0", "944ac7d34d0bd2ac8998f79f7a811b21d87d911e77a786bc5810adb75632ada4", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: false]}, {:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:mint, "~> 1.3", [hex: :mint, repo: "hexpm", optional: false]}, {:nimble_options, "~> 0.4 or ~> 1.0", [hex: :nimble_options, repo: "hexpm", optional: false]}, {:nimble_pool, "~> 0.2.6 or ~> 1.0", [hex: :nimble_pool, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "69f5045b042e531e53edc2574f15e25e735b522c37e2ddb766e15b979e03aa65"},
   "git_cli": {:hex, :git_cli, "0.3.0", "a5422f9b95c99483385b976f5d43f7e8233283a47cda13533d7c16131cb14df5", [:mix], [], "hexpm", "78cb952f4c86a41f4d3511f1d3ecb28edb268e3a7df278de2faa1bd4672eaf9b"},
   "git_ops": {:hex, :git_ops, "2.6.1", "cc7799a68c26cf814d6d1a5121415b4f5bf813de200908f930b27a2f1fe9dad5", [:mix], [{:git_cli, "~> 0.2", [hex: :git_cli, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.0", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "ce62d07e41fe993ec22c35d5edb11cf333a21ddaead6f5d9868fcb607d42039e"},
   "glob_ex": {:hex, :glob_ex, "0.1.10", "d819a368637495a5c1962ef34f48fe4e9a09032410b96ade5758f2cd1cc5fcde", [:mix], [], "hexpm", "c75357e57d71c85ef8ef7269b6e787dce3f0ff71e585f79a90e4d5477c532b90"},
-  "hpax": {:hex, :hpax, "1.0.0", "28dcf54509fe2152a3d040e4e3df5b265dcb6cb532029ecbacf4ce52caea3fd2", [:mix], [], "hexpm", "7f1314731d711e2ca5fdc7fd361296593fc2542570b3105595bb0bc6d0fad601"},
   "igniter": {:hex, :igniter, "0.3.76", "ff283416402f4d1ef3f79ab57d38aac08389b3768fc81da03795ce5347f1167f", [:mix], [{:glob_ex, "~> 0.1.7", [hex: :glob_ex, repo: "hexpm", optional: false]}, {:jason, "~> 1.4", [hex: :jason, repo: "hexpm", optional: false]}, {:rewrite, "~> 0.9", [hex: :rewrite, repo: "hexpm", optional: false]}, {:sourceror, "~> 1.4", [hex: :sourceror, repo: "hexpm", optional: false]}, {:spitfire, ">= 0.1.3 and < 1.0.0-0", [hex: :spitfire, repo: "hexpm", optional: false]}], "hexpm", "4692f874f969dc4856167469a3415a5a57a362314f37e1cdb14431316a74e896"},
   "iterex": {:hex, :iterex, "0.1.1", "90378a9561ad87da46737dceaf02e68a0b3023746216a4de34a0c509f5f505d4", [:mix], [], "hexpm", "c4f5916a6dbb03aa4c3d5c480069e13075ca6a57bd0c28d643da3891962440ad"},
   "jason": {:hex, :jason, "1.4.4", "b9226785a9aa77b6857ca22832cffa5d5011a667207eb2a0ad56adb5db443b8a", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "c5eb0cab91f094599f94d55bc63409236a8ec69a21a67814529e8d5f6cc90b3b"},
@@ -22,15 +19,10 @@
   "makeup": {:hex, :makeup, "1.1.2", "9ba8837913bdf757787e71c1581c21f9d2455f4dd04cfca785c70bbfff1a76a3", [:mix], [{:nimble_parsec, "~> 1.2.2 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "cce1566b81fbcbd21eca8ffe808f33b221f9eee2cbc7a1706fc3da9ff18e6cac"},
   "makeup_elixir": {:hex, :makeup_elixir, "0.16.2", "627e84b8e8bf22e60a2579dad15067c755531fea049ae26ef1020cad58fe9578", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "41193978704763f6bbe6cc2758b84909e62984c7752b3784bd3c218bb341706b"},
   "makeup_erlang": {:hex, :makeup_erlang, "0.1.5", "e0ff5a7c708dda34311f7522a8758e23bfcd7d8d8068dc312b5eb41c6fd76eba", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "94d2e986428585a21516d7d7149781480013c56e30c6a233534bedf38867a59a"},
-  "mime": {:hex, :mime, "2.0.6", "8f18486773d9b15f95f4f4f1e39b710045fa1de891fada4516559967276e4dc2", [:mix], [], "hexpm", "c9945363a6b26d747389aac3643f8e0e09d30499a138ad64fe8fd1d13d9b153e"},
   "mimic": {:hex, :mimic, "1.8.2", "f4cf6ad13a305c5ee1a6c304ee36fc7afb3ad748e2af8cd5fbf122f44a283534", [:mix], [], "hexpm", "abc982d5fdcc4cb5292980cb698cd47c0c5d9541b401e540fb695b69f1d46485"},
-  "mint": {:hex, :mint, "1.6.2", "af6d97a4051eee4f05b5500671d47c3a67dac7386045d87a904126fd4bbcea2e", [:mix], [{:castore, "~> 0.1.0 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:hpax, "~> 0.1.1 or ~> 0.2.0 or ~> 1.0", [hex: :hpax, repo: "hexpm", optional: false]}], "hexpm", "5ee441dffc1892f1ae59127f74afe8fd82fda6587794278d924e4d90ea3d63f9"},
   "mix_audit": {:hex, :mix_audit, "2.1.3", "c70983d5cab5dca923f9a6efe559abfb4ec3f8e87762f02bab00fa4106d17eda", [:make, :mix], [{:jason, "~> 1.1", [hex: :jason, repo: "hexpm", optional: false]}, {:yaml_elixir, "~> 2.9", [hex: :yaml_elixir, repo: "hexpm", optional: false]}], "hexpm", "8c3987100b23099aea2f2df0af4d296701efd031affb08d0746b2be9e35988ec"},
   "mix_test_watch": {:hex, :mix_test_watch, "1.2.0", "1f9acd9e1104f62f280e30fc2243ae5e6d8ddc2f7f4dc9bceb454b9a41c82b42", [:mix], [{:file_system, "~> 0.2 or ~> 1.0", [hex: :file_system, repo: "hexpm", optional: false]}], "hexpm", "278dc955c20b3fb9a3168b5c2493c2e5cffad133548d307e0a50c7f2cfbf34f6"},
-  "nimble_options": {:hex, :nimble_options, "1.1.1", "e3a492d54d85fc3fd7c5baf411d9d2852922f66e69476317787a7b2bb000a61b", [:mix], [], "hexpm", "821b2470ca9442c4b6984882fe9bb0389371b8ddec4d45a9504f00a66f650b44"},
   "nimble_parsec": {:hex, :nimble_parsec, "1.4.0", "51f9b613ea62cfa97b25ccc2c1b4216e81df970acd8e16e8d1bdc58fef21370d", [:mix], [], "hexpm", "9c565862810fb383e9838c1dd2d7d2c437b3d13b267414ba6af33e50d2d1cf28"},
-  "nimble_pool": {:hex, :nimble_pool, "1.1.0", "bf9c29fbdcba3564a8b800d1eeb5a3c58f36e1e11d7b7fb2e084a643f645f06b", [:mix], [], "hexpm", "af2e4e6b34197db81f7aad230c1118eac993acc0dae6bc83bac0126d4ae0813a"},
-  "req": {:hex, :req, "0.5.2", "70b4976e5fbefe84e5a57fd3eea49d4e9aa0ac015301275490eafeaec380f97f", [:mix], [{:brotli, "~> 0.3.1", [hex: :brotli, repo: "hexpm", optional: true]}, {:ezstd, "~> 1.0", [hex: :ezstd, repo: "hexpm", optional: true]}, {:finch, "~> 0.17", [hex: :finch, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}, {:mime, "~> 2.0.6 or ~> 2.1", [hex: :mime, repo: "hexpm", optional: false]}, {:nimble_csv, "~> 1.0", [hex: :nimble_csv, repo: "hexpm", optional: true]}, {:plug, "~> 1.0", [hex: :plug, repo: "hexpm", optional: true]}], "hexpm", "0c63539ab4c2d6ced6114d2684276cef18ac185ee00674ee9af4b1febba1f986"},
   "rewrite": {:hex, :rewrite, "0.10.5", "6afadeae0b9d843b27ac6225e88e165884875e0aed333ef4ad3bf36f9c101bed", [:mix], [{:glob_ex, "~> 0.1", [hex: :glob_ex, repo: "hexpm", optional: false]}, {:sourceror, "~> 1.0", [hex: :sourceror, repo: "hexpm", optional: false]}], "hexpm", "51cc347a4269ad3a1e7a2c4122dbac9198302b082f5615964358b4635ebf3d4f"},
   "sobelow": {:hex, :sobelow, "0.13.0", "218afe9075904793f5c64b8837cc356e493d88fddde126a463839351870b8d1e", [:mix], [{:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "cd6e9026b85fc35d7529da14f95e85a078d9dd1907a9097b3ba6ac7ebbe34a0d"},
   "sourceror": {:hex, :sourceror, "1.6.0", "9907884e1449a4bd7dbaabe95088ed4d9a09c3c791fb0103964e6316bc9448a7", [:mix], [], "hexpm", "e90aef8c82dacf32c89c8ef83d1416fc343cd3e5556773eeffd2c1e3f991f699"},
diff --git a/test/reactor/bugs/switch_preceding_steps_test.exs b/test/reactor/bugs/switch_preceding_steps_test.exs
new file mode 100644
index 0000000..51189cc
--- /dev/null
+++ b/test/reactor/bugs/switch_preceding_steps_test.exs
@@ -0,0 +1,89 @@
+defmodule Reactor.Bugs.SwitchPrecedingStepsTest do
+  @moduledoc false
+  use ExUnit.Case, async: false
+  import ExUnit.CaptureLog
+
+  defmodule MooStep do
+    @moduledoc false
+    use Reactor.Step
+    require Logger
+
+    def run(_args, _context, _opts) do
+      Logger.warning("MOO")
+      {:ok, :moo}
+    end
+  end
+
+  defmodule BooStep do
+    @moduledoc false
+    use Reactor.Step
+    require Logger
+
+    def run(args, _context, _opts) do
+      Logger.warning("BOO")
+      {:ok, !args.value}
+    end
+  end
+
+  defmodule TruthyStep do
+    @moduledoc false
+    use Reactor.Step
+    require Logger
+
+    def run(_args, _context, _opts) do
+      Logger.warning("TRUTHY")
+      {:ok, :truthy}
+    end
+  end
+
+  defmodule FalsyStep do
+    @moduledoc false
+    use Reactor.Step
+    require Logger
+
+    def run(_args, _context, _opts) do
+      Logger.warning("FALSY")
+      {:ok, :falsy}
+    end
+  end
+
+  defmodule BugReactor do
+    @moduledoc false
+    use Reactor
+
+    input :value
+
+    step :moo, MooStep
+
+    step :boo, BooStep do
+      argument :value, input(:value)
+    end
+
+    switch :is_truthy? do
+      on result(:boo)
+
+      matches? &(&1 in [nil, false]) do
+        step :falsy, FalsyStep
+      end
+
+      default do
+        step :truthy, TruthyStep
+      end
+    end
+  end
+
+  test "steps preceding a switch only get executed once" do
+    logs =
+      [level: :warning, format: "$message\n", colors: [enabled: false]]
+      |> capture_log(fn ->
+        Reactor.run(BugReactor, %{value: true})
+      end)
+      |> String.split(~r/\n+/)
+      |> Enum.reject(&(&1 == ""))
+      |> Enum.frequencies()
+
+    assert logs["MOO"] == 1
+    assert logs["BOO"] == 1
+    assert logs["FALSY"] == 1
+  end
+end