Your Smart TV is probably ignoring your PiHole

 https://labzilla.io/blog/force-dns-pihole

Smart devices manufacturers often “hard-code” in a public DNS server, like Google’s 8.8.8.8, and their devices ignore whatever DNS server is assigned by your router - such as your PiHole.

Nearly 70% of smart TVs and 46% of game consoles were found to contain hardcoded DNS settings - allowing them to simply ignore your local network’s DNS server entirely. On average, Smart TVs generate an average of 60 megabytes of outgoing Internet traffic per day, all the while bypassing tools like PiHole.