Just tried it and can verify it does the same thing on the “on now” tab.
It is finicky on all the tabs.
Sometimes it can work very reliably and toggle pip when navigating between the guide, library, on now, on later, etc just as expected. In fact I couldnt get it happening just now at all and I was excited. But I know Ive seen the issue as recently as today using the guide tab. In the meantime Ive been doing lots of things non channels related on my apple tv all day…
So to be thorough,
1: I went into the apple tv settings and did a soft restart.
2: Then I opened channels beta - observed “preparing your tv”
3: Then I went into the on now guide and selected a live station. Then I used the toggle pip shortcut on my sofabaton, and the issue presented itself again the first time i tried.
Way way back years ago you entertained the possibility of writing some diagnostic code to narrow this issue down. If I remember, I think you were seeing two back to back toggles which confused the code. I moved on and began using the iProTv app for my 99% of my pip needs so I never poked you and followed through.
It seems some other folks might be seeing this now.
Im happy to do further testing if you would like. Just let me know.