diff --git a/packages/playwright-core/src/server/chromium/chromiumSwitches.ts b/packages/playwright-core/src/server/chromium/chromiumSwitches.ts
index 34c89af653e4d..5064145fb8fe3 100644
--- a/packages/playwright-core/src/server/chromium/chromiumSwitches.ts
+++ b/packages/playwright-core/src/server/chromium/chromiumSwitches.ts
@@ -35,9 +35,8 @@ export const chromiumSwitches = [
   // Translate - https://github.com/microsoft/playwright/issues/16126
   // HttpsUpgrades - https://github.com/microsoft/playwright/pull/27605
   // PaintHolding - https://github.com/microsoft/playwright/issues/28023
-  // PlzDedicatedWorker - https://github.com/microsoft/playwright/issues/31747
   // ThirdPartyStoragePartitioning - https://github.com/microsoft/playwright/issues/32230
-  '--disable-features=ImprovedCookieControls,LazyFrameLoading,GlobalMediaControls,DestroyProfileOnBrowserClose,MediaRouter,DialMediaRouteProvider,AcceptCHFrame,AutoExpandDetailsElement,CertificateTransparencyComponentUpdater,AvoidUnnecessaryBeforeUnloadCheckSync,Translate,HttpsUpgrades,PaintHolding,PlzDedicatedWorker,ThirdPartyStoragePartitioning',
+  '--disable-features=ImprovedCookieControls,LazyFrameLoading,GlobalMediaControls,DestroyProfileOnBrowserClose,MediaRouter,DialMediaRouteProvider,AcceptCHFrame,AutoExpandDetailsElement,CertificateTransparencyComponentUpdater,AvoidUnnecessaryBeforeUnloadCheckSync,Translate,HttpsUpgrades,PaintHolding,ThirdPartyStoragePartitioning',
   '--allow-pre-commit-input',
   '--disable-hang-monitor',
   '--disable-ipc-flooding-protection',
diff --git a/tests/page/interception.spec.ts b/tests/page/interception.spec.ts
index 338ac97a05dd7..e50b5fdb086ca 100644
--- a/tests/page/interception.spec.ts
+++ b/tests/page/interception.spec.ts
@@ -123,20 +123,24 @@ it('should intercept network activity from worker', async function({ page, serve
 
 it('should intercept worker requests when enabled after worker creation', {
   annotation: { type: 'issue', description: 'https://github.com/microsoft/playwright/issues/32355' }
-}, async function({ page, server, isAndroid, browserName }) {
+}, async ({ page, server, isAndroid, browserName }) => {
   it.skip(isAndroid);
   it.fixme(browserName === 'chromium');
 
   await page.goto(server.EMPTY_PAGE);
   server.setRoute('/data_for_worker', (req, res) => res.end('failed to intercept'));
   const url = server.PREFIX + '/data_for_worker';
-  await page.evaluate(url => {
-    (window as any).w = new Worker(URL.createObjectURL(new Blob([`
-    onmessage = function(e) {
-      fetch("${url}").then(response => response.text()).then(console.log);
-    };
-  `], { type: 'application/javascript' })));
-  }, url);
+  await Promise.all([
+    page.waitForEvent('worker'),
+    page.evaluate(url => {
+      (window as any).w = new Worker(URL.createObjectURL(new Blob([`
+        onmessage = function(e) {
+          fetch("${url}").then(response => response.text()).then(console.log);
+        };
+      `], { type: 'application/javascript' })));
+    }, url),
+  ]);
+  // Install the route **after** the worker has been created.
   await page.route(url, route => {
     route.fulfill({
       status: 200,
@@ -150,7 +154,9 @@ it('should intercept worker requests when enabled after worker creation', {
   expect(msg.text()).toBe('intercepted');
 });
 
-it('should intercept network activity from worker 2', async function({ page, server, isAndroid }) {
+it('should intercept network activity from worker 2', {
+  annotation: { type: 'issue', description: 'https://github.com/microsoft/playwright/issues/31747' }
+}, async ({ page, server, isAndroid }) => {
   it.skip(isAndroid);
 
   const url = server.PREFIX + '/worker/worker.js';
diff --git a/tests/page/workers.spec.ts b/tests/page/workers.spec.ts
index 3b4d1bf5c8cae..ead741602b072 100644
--- a/tests/page/workers.spec.ts
+++ b/tests/page/workers.spec.ts
@@ -225,7 +225,9 @@ it('should report and intercept network from nested worker', async function({ pa
   await expect.poll(() => messages).toEqual(['{"foo":"not bar"}', '{"foo":"not bar"}']);
 });
 
-it('should support extra http headers', async ({ page, server }) => {
+it('should support extra http headers', {
+  annotation: { type: 'issue', description: 'https://github.com/microsoft/playwright/issues/31747' }
+}, async ({ page, server }) => {
   await page.setExtraHTTPHeaders({ foo: 'bar' });
   const [worker, request1] = await Promise.all([
     page.waitForEvent('worker'),