Cookie-blocking not working in Firefox 104.0.2 for Mac

In Preferences > Privacy & Security > Exceptions - Cookies and Site Data, I have “http://google.com” and “https://google.com” listed as being blocked from setting cookies. Yet when I check cookies that have been recently set, I routinely (again and again, over many months) see google.com setting cookies. Same thing for youtube.com.

Is this a glitch?