PiP not working apple tv

Apologies if this has come up before but I could not find it in the search.

I am trying to use PiP on Apple TV 4kGen1 and find that when setting up PiP, as soon as I start another video source (channels/YouTube etc) the small screen (infuse) pauses playback. Only way to restart it is to make it big again.

I thought the point of PiP was to be able to play 2 sources at the same time. Can anyone shed any light on what I am doing wrong?

edit: infuse 7.2.1, TV OS 15.1.1

Thanks

Is this still happening for you in Infuse 7.3 and tvOS 15.2?

Does this also happen when using a different combination of apps (EG Channels + YouTube, Netflix + YouTube, etc…)?