As far as I can tell, this affects all of them. If anyone has advice on how to recreate that functionality under Tahoe (except full screen YouTube), I'd be happy to hear it.
You haven’t needed external apps for that for over a decade, macOS ships with a `caffeinate` command-line tool. But I also just tried the Caffeine app on a test Tahoe machine, and it worked fine.
For the whole two days I used Tahoe I didn't see any issues with "KeepingYouAwake", so you may want to try that. It's available in homebrew as a cask if I'm not mistaken
