The same happens for me on iPadOS. Watching PiP while browsing the Twitch App works fine, but after switchting to a different App with PiP still running the Twitch App seams to crash in the background after a few seconds, resulting in the PiP to stop as well.
The same happens for me on iPadOS. Watching PiP while browsing the Twitch App works fine, but after switchting to a different App with PiP still running the Twitch App seams to crash in the background after a few seconds, resulting in the PiP to stop as well.