diff --git a/Sources/_OpenAPIGeneratorCore/GeneratorPipeline.swift b/Sources/_OpenAPIGeneratorCore/GeneratorPipeline.swift
index 22e12874..e38df8d2 100644
--- a/Sources/_OpenAPIGeneratorCore/GeneratorPipeline.swift
+++ b/Sources/_OpenAPIGeneratorCore/GeneratorPipeline.swift
@@ -103,21 +103,21 @@ func makeGeneratorPipeline(
     config: Config,
     diagnostics: any DiagnosticCollector
 ) -> GeneratorPipeline {
+    let filterDoc = { (doc: OpenAPI.Document) -> OpenAPI.Document in
+        guard let documentFilter = config.filter else { return doc }
+        let filteredDoc: OpenAPI.Document = try documentFilter.filter(doc)
+        return filteredDoc
+    }
+    let validateDoc = { (doc: OpenAPI.Document) -> OpenAPI.Document in
+        let validationDiagnostics = try validator(doc, config)
+        for diagnostic in validationDiagnostics { diagnostics.emit(diagnostic) }
+        return doc
+    }
     return .init(
         parseOpenAPIFileStage: .init(
             preTransitionHooks: [],
             transition: { input in try parser.parseOpenAPI(input, config: config, diagnostics: diagnostics) },
-            postTransitionHooks: [
-                { document in
-                    guard let documentFilter = config.filter else { return document }
-                    return try documentFilter.filter(document)
-                },
-                { doc in
-                    let validationDiagnostics = try validator(doc, config)
-                    for diagnostic in validationDiagnostics { diagnostics.emit(diagnostic) }
-                    return doc
-                },
-            ]
+            postTransitionHooks: [filterDoc, validateDoc]
         ),
         translateOpenAPIToStructuredSwiftStage: .init(
             preTransitionHooks: [],
diff --git a/docker/docker-compose.2204.main.yaml b/docker/docker-compose.2204.main.yaml
index d59e7ce2..970dc360 100644
--- a/docker/docker-compose.2204.main.yaml
+++ b/docker/docker-compose.2204.main.yaml
@@ -11,7 +11,8 @@ services:
   test:
     image: *image
     environment:
-      - WARN_AS_ERROR_ARG=-Xswiftc -warnings-as-errors
+      # Disable warnings as errors on nightlies as they are still in-development.
+      # - WARN_AS_ERROR_ARG=-Xswiftc -warnings-as-errors
       - IMPORT_CHECK_ARG=--explicit-target-dependency-import-check error
       - STRICT_CONCURRENCY_ARG=-Xswiftc -strict-concurrency=complete
   shell: