ASWebAuthenticationSession cookie

Does anyone else have issues with cookies in WKWebview on iOS 13? It worked on iOS 12.We need our app which runs in WKWebview on a custom protocol (custom://localhost) to call servers with cookies which allow this origin. The login returns a cookie but it is not used for subsequent requests.This webkit bug is related: https://bugs.webkit.org/show_bug.cgi?id=140205

I have an iframe on my page. As Safari blocks 3rd party cookies, I am trying to use the Storage Access API as suggested here under 'Developer Guidance': https://webkit.org/blog/10218/full-third-party-cookie-blocking-and-more/. I have copied the following code from here https://developer.mozilla.org/en-US/docs/Web/API/Storage_Access_API/Using#Accessing_a_user's_cookies_in_an_embedded_cross-origin_iframe:<script type=text/javascript> window.addEventListener('load', () => { document.getElementById('test-button').addEventListener('click', () => { document.hasStorageAccess().then(hasAccess => { console.log('hasAccess: ' + hasAccess); if (!hasAccess) { return document.requestStorageAccess(); } }).then(_ => { console.log('Now we have first-party storage access!'); document.cookie = foo=bar; console.log(`document.cookie: ${document.cookie}`); }).catch(_ => { console.log('error'); }); }); });</script><button id=test-button>Test</button>Browser console output:[Lo

Using the following javascript code to set a cookie in Safari results in an incorrect expiry date being set on the cookie. The same code produces the correct result in Google Chrome. document.cookie = cookie_name=1615209245; expires=Tue, 08 Mar 2022 13:14:05 GMT; path=/; This code produces a cookie with an expiry date of March 8, 2022 in Google Chrome as expected, but incorrectly as March, 16, 2021 in Safari. Is this a known issue? What can I do to get the correct result?