Spent ages trying to work out why my Macbook Pro (2020) on Ventura OS was connecting to my Deco mesh wifi but had no internet access / all websites were timing out, when all other devices were working ok.

On my Macbook, I went into System Settings > Wi-fi, clicked on Details, then TCP/IP, and I changed the Configure IPv6 setting from "Automatically" to "Link-Local Only", and that made everything work again instantly.

Not looked into why this worked, I can guess but, just posting my fix here for others to try.