diff --git a/src/logging/diagnostic-stability-bundle.test.ts b/src/logging/diagnostic-stability-bundle.test.ts
index 60e6aebc99f..fa02e257ef8 100644
--- a/src/logging/diagnostic-stability-bundle.test.ts
+++ b/src/logging/diagnostic-stability-bundle.test.ts
@@ -107,25 +107,15 @@ describe("diagnostic stability bundles", () => {
     const bundle = readBundle(file);
     const raw = fs.readFileSync(file, "utf8");
 
-    expect(bundle).toMatchObject({
-      version: 1,
-      generatedAt: "2026-04-22T12:00:00.000Z",
-      reason: "gateway.restart_startup_failed",
-      error: {
-        name: "Error",
-        code: "ERR_TEST",
-      },
-      host: {
-        hostname: "<redacted-hostname>",
-      },
-      snapshot: {
-        count: 2,
-      },
-    });
-    expect(bundle.snapshot.events[0]).toMatchObject({
-      type: "webhook.error",
-      channel: "telegram",
-    });
+    expect(bundle.version).toBe(1);
+    expect(bundle.generatedAt).toBe("2026-04-22T12:00:00.000Z");
+    expect(bundle.reason).toBe("gateway.restart_startup_failed");
+    expect(bundle.error?.name).toBe("Error");
+    expect(bundle.error?.code).toBe("ERR_TEST");
+    expect(bundle.host.hostname).toBe("<redacted-hostname>");
+    expect(bundle.snapshot.count).toBe(2);
+    expect(bundle.snapshot.events[0]?.type).toBe("webhook.error");
+    expect(bundle.snapshot.events[0]?.channel).toBe("telegram");
     expect(bundle.snapshot.events[0]).not.toHaveProperty("chatId");
     expect(bundle.snapshot.events[0]).not.toHaveProperty("error");
     expect(bundle.error?.message).toContain("google/web-search-contract-api.js");
@@ -161,18 +151,14 @@ describe("diagnostic stability bundles", () => {
     }
     const bundle = readBundle(result.path);
     const raw = fs.readFileSync(result.path, "utf8");
-    expect(bundle).toMatchObject({
-      reason: "gateway.restart_startup_failed",
-      error: {
-        name: "Error",
-        code: "ERR_CONFIG_PARSE",
-        message: "raw startup config payload",
-      },
-      snapshot: {
-        count: 0,
-        events: [],
-      },
+    expect(bundle.reason).toBe("gateway.restart_startup_failed");
+    expect(bundle.error).toEqual({
+      name: "Error",
+      code: "ERR_CONFIG_PARSE",
+      message: "raw startup config payload",
     });
+    expect(bundle.snapshot.count).toBe(0);
+    expect(bundle.snapshot.events).toEqual([]);
     expect(raw).not.toContain("stack");
   });