diff --git a/packages/ui/components/core/test/ScopedElementsMixin.test.js b/packages/ui/components/core/test/ScopedElementsMixin.test.js
index 7aea78c1f..64c281b16 100644
--- a/packages/ui/components/core/test/ScopedElementsMixin.test.js
+++ b/packages/ui/components/core/test/ScopedElementsMixin.test.js
@@ -140,7 +140,7 @@ describe('ScopedElementsMixin', () => {
       }
       customElements.define('scoped-elements-host-no-reg-2', ScopedElementsHostNoReg2);
 
-      const errorSpy = sinon.spy(console, 'error');
+      const errorStub = sinon.stub(console, 'error');
       /** @type {ScopedElementsHostNoReg2} */ (
         await fixture(html`<scoped-elements-host-no-reg></scoped-elements-host-no-reg>`)
       );
@@ -148,7 +148,7 @@ describe('ScopedElementsMixin', () => {
         await fixture(html`<scoped-elements-host-no-reg-2></scoped-elements-host-no-reg-2>`)
       );
 
-      expect(errorSpy.args[0][0]).to.equal(
+      expect(errorStub.args[0][0]).to.equal(
         [
           'You are trying to re-register the "scoped-elements-child-no-reg" custom element with a different class via ScopedElementsMixin.',
           'This is only possible with a CustomElementRegistry.',
@@ -158,7 +158,7 @@ describe('ScopedElementsMixin', () => {
           'For more details you can visit https://open-wc.org/docs/development/scoped-elements/',
         ].join('\n'),
       );
-      errorSpy.restore();
+      errorStub.restore();
     });
   });
 });
diff --git a/packages/ui/components/form-integrations/test/dialog-integrations.test.js b/packages/ui/components/form-integrations/test/dialog-integrations.test.js
index 9e68e54a3..115dce2f1 100644
--- a/packages/ui/components/form-integrations/test/dialog-integrations.test.js
+++ b/packages/ui/components/form-integrations/test/dialog-integrations.test.js
@@ -9,6 +9,7 @@ import { html } from 'lit';
 import { isActiveElement } from '../../core/test-helpers/isActiveElement.js';
 import { getAllTagNames } from './helpers/helpers.js';
 import './helpers/umbrella-form.js';
+
 /**
  * @typedef {import('./helpers/umbrella-form.js').UmbrellaForm} UmbrellaForm
  * @typedef {import('../../dialog/src/LionDialog.js').LionDialog} LionDialog
@@ -25,10 +26,12 @@ describe('Form inside dialog Integrations', () => {
       </lion-dialog>`,
     );
 
-    // @ts-ignore
-    const formEl = /** @type {LionForm} */ (el._overlayCtrl.contentNode._lionFormNode);
+    // @ts-expect-error [allow-protected-in-tests]
+    const umbrellaEl = el._overlayCtrl.contentNode;
+    const formEl = /** @type {LionForm} */ (umbrellaEl._lionFormNode);
     await formEl.registrationComplete;
     const registeredEls = getAllTagNames(formEl);
+    await umbrellaEl.waitForAllChildrenUpdates();
 
     expect(registeredEls).to.eql([
       'lion-fieldset',
@@ -86,6 +89,7 @@ describe('Form inside dialog Integrations', () => {
         </div>
       </lion-dialog>
     `);
+
     // @ts-expect-error [allow-protected-in-tests]
     el._overlayInvokerNode.click();
     const lionInput = el.querySelector('[name="input"]');
diff --git a/web-test-runner.config.mjs b/web-test-runner.config.mjs
index 033fab500..724171eae 100644
--- a/web-test-runner.config.mjs
+++ b/web-test-runner.config.mjs
@@ -44,5 +44,8 @@ export default {
     playwrightLauncher({ product: 'webkit' }),
   ],
   groups,
+  filterBrowserLogs(/** @type {{ type: 'error'|'warn'|'debug'; args: string[] }} */ log) {
+    return log.type === 'error' || log.type === 'debug';
+  },
   plugins: [litSsrPlugin()],
 };