Bring back PiP (picture-in-picture/split-screen)

I used to split Deezer's screen with other apps, but it seems that changed months ago. 

I can split the screen for most other apps, but when I try to do this with Deezer, I get a toast saying the app doesn't support this.
 

I have been testing every new version. but I always end up going back to v6.0.6 to use split screen. 

Please consider enabling it again.