YouTube apparently no longer doing the "still watching", which I relied on at night

I'm not entirely sure if it's a bug, so I'm sorry if the flair is wrong. Basically, my TV (Hisense fire Amazon) turns off when idle after 10 minutes or so, so whenever it's just on the home menu or on YouTube if nothing is playing or the video is paused. It doesn't happen if the video is actively playing.

So I leave YouTube playing at night, and in the morning my TV is off, I assume the "still watching" comes up, pauses the video, and the TV turns off after a while. Now, for like a week, the TV has still been on in the morning. I haven't changed any settings. I've seen a suggestion about tweaking the "auto pause" setting, but that doesn't exist on my end.

Why would that feature stop working? Any advice?