diff --git a/packages/playwright-core/src/server/electron/electron.ts b/packages/playwright-core/src/server/electron/electron.ts
index 7ad3995494..384f346111 100644
--- a/packages/playwright-core/src/server/electron/electron.ts
+++ b/packages/playwright-core/src/server/electron/electron.ts
@@ -130,7 +130,7 @@ export class Electron extends SdkObject {
     controller.setLogName('browser');
     return controller.run(async progress => {
       let app: ElectronApplication | undefined = undefined;
-      const electronArguments = ['-r', require.resolve('./loader'), '--inspect=0', '--remote-debugging-port=0', ...args];
+      const electronArguments = ['--inspect=0', '--remote-debugging-port=0', ...args];
 
       if (os.platform() === 'linux') {
         const runningAsRoot = process.geteuid && process.geteuid() === 0;
@@ -160,6 +160,9 @@ export class Electron extends SdkObject {
           }
           throw error;
         }
+        // Only use our own loader for non-packaged apps.
+        // Packaged apps might have their own command line handling.
+        electronArguments.unshift('-r', require.resolve('./loader'));
       }
 
       // When debugging Playwright test that runs Electron, NODE_OPTIONS
diff --git a/tests/electron/electron-app.spec.ts b/tests/electron/electron-app.spec.ts
index c221d51db4..ee54cf2e2a 100644
--- a/tests/electron/electron-app.spec.ts
+++ b/tests/electron/electron-app.spec.ts
@@ -49,10 +49,10 @@ test('should script application', async ({ electronApp }) => {
 });
 
 test('should preserve args', async ({ launchElectronApp, isMac }) => {
-  test.fixme(isMac, 'https://github.com/microsoft/playwright/issues/21512');
   const electronApp = await launchElectronApp('electron-app-args.js', ['foo', 'bar']);
   const argv = await electronApp.evaluate(async () => globalThis.argv);
-  expect(argv).toEqual([expect.stringContaining(path.join('dist', 'electron')), expect.stringContaining(path.join('electron', 'electron-app-args.js')), 'foo', 'bar']);
+  const electronPath = isMac ? path.join('dist', 'Electron.app') : path.join('dist', 'electron');
+  expect(argv).toEqual([expect.stringContaining(electronPath), expect.stringContaining(path.join('electron', 'electron-app-args.js')), 'foo', 'bar']);
 });
 
 test('should return windows', async ({ electronApp, newWindow }) => {
diff --git a/tests/electron/electronTest.ts b/tests/electron/electronTest.ts
index 05361a20ff..68261cfa16 100644
--- a/tests/electron/electronTest.ts
+++ b/tests/electron/electronTest.ts
@@ -16,7 +16,7 @@
 
 import { baseTest } from '../config/baseTest';
 import * as path from 'path';
-import type { ElectronApplication, Page } from '@playwright/test';
+import type { ElectronApplication, Page, Electron } from '@playwright/test';
 import type { PageTestFixtures, PageWorkerFixtures } from '../page/pageTestApi';
 import type { TraceViewerFixtures } from '../config/traceViewerFixtures';
 import { traceViewerFixtures } from '../config/traceViewerFixtures';
@@ -26,7 +26,7 @@ import { assert } from '../../packages/playwright-core/lib/utils/debug';
 
 type ElectronTestFixtures = PageTestFixtures & {
   electronApp: ElectronApplication;
-  launchElectronApp: (appFile: string, args?: string[], options?: any) => Promise<ElectronApplication>;
+  launchElectronApp: (appFile: string, args?: string[], options?: Parameters<Electron['launch']>[0]) => Promise<ElectronApplication>;
   newWindow: () => Promise<Page>;
 };
 
@@ -45,7 +45,7 @@ export const electronTest = baseTest.extend<TraceViewerFixtures>(traceViewerFixt
     // This env prevents 'Electron Security Policy' console message.
     process.env['ELECTRON_DISABLE_SECURITY_WARNINGS'] = 'true';
     const apps: ElectronApplication[] = [];
-    await use(async (appFile: string, args: string[] = [], options?: any[]) => {
+    await use(async (appFile: string, args: string[] = [], options?: Parameters<Electron['launch']>[0]) => {
       const app = await playwright._electron.launch({ ...options, args: [path.join(__dirname, appFile), ...args] });
       apps.push(app);
       return app;