macOS Ventura is officially released to the public and now Safari 16.1 has WebPush support. But while other websites are working with WebPush Twitch notifications are not working. I get the notification button and when I click I do not get the prompt to allow permissions this is only happening on twitch other sites are showing the prompt correctly. I get no notifications when people go live. I have tried clearing cache and checking my setting but it still not working. This is the same WebPush as Firefox and Chrome so resolving this issue should not be a big project. I hope you can pass this onto the dev team to hopefully resolve in the future. See links to the WebPush dev documentation.
https://developer.apple.com/wwdc22/10098
https://webkit.org/blog/12945/meet-web-push/