Miniplayer Problems

The miniplayer doesn't appear when I minimise the app. The video still plays in the background. The miniplayer works when in app. PiP and display over other apps are both allowed. I've deleted and reinstalled several times. I've also tried it with the previous version.

I have a lot of lines in my patching/installing logs saying this...

Warning: Could not decode attr value, using undecoded value instead: ns=android, name=theme, value=0x7f150815