Invalid or unsupported WebDriver capabilities found ("app", "appArguments") with WinAPPDriver

Environment (please complete the following information):

• WebdriverIO version: latest
• If WDIO Testrunner, running sync/async: sync
• Node.js version: 14.16.0
• NPM version: 6.4.11
• Additional wdio packages used (if applicable): services: [‘winappdriver’],

Config of WebdriverIO

require('ts-node').register({ transpileOnly: true });

exports.config = {
    runner: "local",

    specs: ["./test/specs/*.ts"],
  
    maxInstances: 1,
  
    port: 4723,
    capabilities: [
      {
        app: "Microsoft.WindowsAlarms_8wekyb3d8bbwe!App",
        appArguments: '-noCloseConfirmationPopUp',
        "ms:experimental-webdriver": true,
        browserName: "",
      },
    ],
    logLevel: "trace",
    services: ["winappdriver"],
    framework: "jasmine",
    outputDir: ".\\reports",
    reporters: ["dot", ["junit", { outputDir: ".\\reports" }]],
  
    before() {
      //implicit wait for 5 seconds
      browser.setTimeout({ implicit: 5000 });
    },
  
    jasmineNodeOpts: {
      defaultTimeoutInterval: 30000,
      expectationResultHandler: function (passed, assertion) {
        /**
         * only take screenshot if assertion failed
         */
        if (passed) {
          return;
        }
  
        browser.getPageSource();
        browser.saveScreenshot(
          `.\\reports\\assertionError_${assertion.error.message}.png`
        );
      },
    }
}

Describe the bug Unable to launch a test with WebDriverIO V7 on a windows application , please see this error : Error: Invalid or unsupported WebDriver capabilities found ("app", "appArguments"). Ensure to only use valid W3C WebDriver capabilities (see https://w3c.github.io/webdriver/#capabilities).

To Reproduce Steps to reproduce the behavior:

• Install this project and update WebdriverIO : https://github.com/licanhua/wdio-winappdriver-example
• npm run test

Expected behavior The app and appArguments capabilities should be accepted by webdriverIO