diff --git a/src/plugins/manifest-registry-installed.test.ts b/src/plugins/manifest-registry-installed.test.ts
index 747552ddd3fd..717d3816bd42 100644
--- a/src/plugins/manifest-registry-installed.test.ts
+++ b/src/plugins/manifest-registry-installed.test.ts
@@ -86,10 +86,10 @@ function createIndexWithFileSignatures(rootDir: string): InstalledPluginIndex {
   const index = createIndex(rootDir);
   return {
     ...index,
-    plugins: index.plugins.map((record) => ({
-      ...record,
-      manifestFile: fileSignature(record.manifestPath),
-    })),
+    plugins: index.plugins.map((record) => {
+      record.manifestFile = fileSignature(record.manifestPath);
+      return record;
+    }),
   };
 }
 
diff --git a/src/plugins/manifest-registry-installed.ts b/src/plugins/manifest-registry-installed.ts
index f31dfaa8a080..0ebcca96aafe 100644
--- a/src/plugins/manifest-registry-installed.ts
+++ b/src/plugins/manifest-registry-installed.ts
@@ -32,7 +32,7 @@ function isDeepFrozenJsonLike(value: unknown, seen = new WeakSet<object>()): boo
   if (!value || typeof value !== "object") {
     return true;
   }
-  const object = value as object;
+  const object = value;
   if (seen.has(object)) {
     return true;
   }