Wow wow!! I’ve just noticed that after more than 5 years, the sneak peek feature is back to its full potential!!
Peeking finally works again like in SFOS 1.0: the foreground app continues to run normally, i.e. the video you’re watching will continue to play in transparency while you check your notifications or the time
I don’t see any mention of “peek” in the changelog so it was maybe done in 3.4 already, but thanks to whoever brought that back. Original report for posterity
Edit: confirmed with my Jolla 1 that it was already there is 3.4.