Ephmeral session or how to clear logged in state in WKWebView after logout?

まず、issue に記載されている login、logout、2 回目の WKWebView login のシーケンスを再現します。Google SignIn signOut() と、WKWebView、HTTPCookieStorage、WKWebsiteDataStore の処理を追跡します。logout 後に再度開いた WKWebView に、以前キャッシュされた Google アカウントが表示されなくなれば完了です。

Describe the bug
I'm wondering how to enable ephemeral session using Google SignIn?
Or how to correctly clear cookies in WKWebView after Google SignIn signOut() method?

To Reproduce
Steps to reproduce the behavior:

1. Login using Google SignIn
2. Opens WKWebView with no google account signed in (email field is cleared)
3. After entering credentials and successful login try to logout
4. Login again
5. Opens WKWebView with cached google account

Expected behavior
(5) Opens WKWebView with no google account signed in (email field is cleared)

Screenshots
none

Environment

• Device: iPhone Simulator
• OS: iOS 16.2
• Browser: Safari

Additional context
I tried to clear cookies

1. In iOS Settings-Safari-Clear History and Website Data

2. Programmatically:

func clearAllCookies() {

         let url = URL(string: "https://accounts.google.com/Logout")!
         UIApplication.shared.open(url, options: [:], completion: nil)

        if let cookies = HTTPCookieStorage.shared.cookies, cookies.count > 0 {
            HTTPCookieStorage.shared.removeCookies(since: .distantPast)
            print("All cookies deleted")
        }
        
        let dataStore = WKWebsiteDataStore.default()
        dataStore.fetchDataRecords(ofTypes: WKWebsiteDataStore.allWebsiteDataTypes()) { records in
            records.forEach { record in
                dataStore.removeData(ofTypes: record.dataTypes, for: [record], completionHandler: {
                    print("Deleted:", record)
                })
            }
        }
    }

None of the above worked.