Google launched a new smart screen interface in 2020, which it may intend to roll out across all devices that run its UI going forward. A new software update may bring that to fruition, with a new look for Android TVs that bring features like that found on the new Chromecast dongle.
https://www.notebookcheck.net/The-latest-Android-TV-update-makes-it-look-more-like-Google-TV.518344.0.html