I've recently bought myself an S20 after using a S7 for years and noticed that, unlike my S7, my screen doesn't seem to want to automatically lock after a YouTube video is done playing. Considering I like to fall asleep with YouTube in the background, this is quite annoying as I'm scared of screen burn.
I've already tried messing around with the timeout settings, but this doesn't seem to help. Googling the issue only shows how to keep your screen on instead. Any tips?