I was surprised today when Firefox upgraded to the latest version. I found a couple sites I visit had been cross linking cookies even under NoScript. Just another sneaky programmer way of tracking us as I thought I had most that stopped. Just make Firefox most secure now. If this causes problems you always change the permissions if desired. The address bar indicate when a cross link cookie have been found active. Now of course I running FF in strict mode.
Reference article.
https://blog.mozilla.org/security/2021/02/23/total-cookie-protection/