diff --git a/src/artifacts/apple/AppleAssetCatalogAnalysis.test.ts b/src/artifacts/apple/AppleAssetCatalogAnalysis.test.ts
index 1c27fd3592..b7da4abcd1 100644
--- a/src/artifacts/apple/AppleAssetCatalogAnalysis.test.ts
+++ b/src/artifacts/apple/AppleAssetCatalogAnalysis.test.ts
@@ -659,3 +659,34 @@ it.each(["Toolbar", "MissingToolbar"])(
     expect(result.resource_key_coverage.status).toBe("complete");
   },
 );
+
+it("preserves every own JSON metadata field through catalog inspection and page projection", async () => {
+  const bundle = await createTestTempDirectory("rea-asset-metadata-members-");
+  const catalog = Buffer.from("inert catalog for the output-decoding boundary");
+  await writeFile(join(bundle, "Assets.car"), catalog);
+  // Authored producer text exercises the accepted metadata contract; it is not
+  // evidence that native assetutil emits these additional field names.
+  const output =
+    '[{"Name":"Toolbar","RenditionName":"Toolbar@2x","__proto__":{"Name":"metadata, not an inherited asset name"},"constructor":"retained constructor metadata","toString":false,"Unknown":{"__proto__":{"value":0}},"Empty":"","Zero":0,"Absent":null}]';
+  const result = await analyzeAppleAssetCatalogs({
+    bundlePath: bundle,
+    targetSha256: "a".repeat(64),
+    environment: {},
+    runAssetUtil: async (path) => {
+      expect(path).toBe(join(bundle, "Assets.car"));
+      return output;
+    },
+  });
+  const expected: unknown = JSON.parse(output);
+  expect(result.records.map(({ metadata }) => metadata)).toEqual(expected);
+  expect(result.records[0]).toMatchObject({
+    asset_name: "Toolbar",
+    rendition_name: "Toolbar@2x",
+    catalog_path: "Assets.car",
+    catalog_sha256: createHash("sha256").update(catalog).digest("hex"),
+  });
+  const metadata = result.records[0]?.metadata;
+  if (metadata === undefined) throw new Error("missing catalog metadata");
+  expect(Object.hasOwn(metadata, "__proto__")).toBe(true);
+  expect(Object.getPrototypeOf(metadata)).toBe(Object.prototype);
+});
diff --git a/src/domain/apple/appleAssetCatalog.ts b/src/domain/apple/appleAssetCatalog.ts
index b4811eec3c..9c70549d08 100644
--- a/src/domain/apple/appleAssetCatalog.ts
+++ b/src/domain/apple/appleAssetCatalog.ts
@@ -1,7 +1,7 @@
 import { z } from "zod";
 import { bundleResourceBoundResultSchema } from "./bundleResourceRoot.js";
 
-import { jsonValueSchema } from "../jsonValue.js";
+import { jsonObjectSchema, jsonValueSchema } from "../jsonValue.js";
 import { AnalysisOutputError } from "../analysisErrorCore.js";
 import {
   artifactInventoryCoverageSchema,
@@ -51,7 +51,7 @@ const recordSchema = z.strictObject({
   kind: z.enum(["catalog", "rendition"]),
   asset_name: z.string().nullable(),
   rendition_name: z.string().nullable(),
-  metadata: z.record(z.string(), jsonValueSchema),
+  metadata: jsonObjectSchema,
 });
 
 const resourceKeyMatchSchema = z.strictObject({
@@ -116,7 +116,7 @@ export const parseAppleAssetCatalogRecords = (
       "assetutil output must be a JSON array",
     );
   return value.map((record, index) => {
-    const parsed = z.record(z.string(), jsonValueSchema).safeParse(record);
+    const parsed = jsonObjectSchema.safeParse(record);
     if (!parsed.success)
       throw new AnalysisOutputError(
         "inspect_asset_catalog",
diff --git a/tests/boundary/filesystem/keyedArchiveScalarStructure.test.ts b/tests/boundary/filesystem/keyedArchiveScalarStructure.test.ts
index f7e6c5adc0..b1a8c58803 100644
--- a/tests/boundary/filesystem/keyedArchiveScalarStructure.test.ts
+++ b/tests/boundary/filesystem/keyedArchiveScalarStructure.test.ts
@@ -43,7 +43,7 @@ it("keeps literal wrapper-shaped dictionaries as real root maps", () => {
   }
 });
 
-it("retains own binary dictionary facts when a prototype key changes the decoder prototype", () => {
+it("retains an own binary dictionary prototype key without changing the decoded prototype", () => {
   const object = Object.fromEntries([
     ["__proto__", { inherited: "not an own fact" }],
     ["payload", "retained"],
@@ -63,8 +63,14 @@ it("retains own binary dictionary facts when a prototype key changes the decoder
     kind: "dictionary",
     value: { payload: "retained" },
   });
-  expect(graph.objects[1]?.value).toEqual({ payload: "retained" });
-  expect(graph.limitations).toContainEqual(
+  const value = graph.objects[1]?.value;
+  expect(value).toEqual(object);
+  if (value === null || typeof value !== "object")
+    throw new Error("Expected a decoded dictionary");
+  expect(Object.hasOwn(value, "__proto__")).toBe(true);
+  expect(Object.hasOwn(value, "inherited")).toBe(false);
+  expect(Object.getPrototypeOf(value)).toBe(Object.prototype);
+  expect(graph.limitations).not.toContainEqual(
     expect.stringContaining("__proto__"),
   );
 });