Splitscreen fails on some iOS devices

I’m trying to get splitscreen working on iOS. It’s working on an iPhone 7 Plus. On a 6 and a 6S the space is reserved for a second player, but that half of the screen stays black.

I haven’t done any splitscreen stuff before so it could be that. Any advice on debugging it?

Also, could it be due to hardware differences?

Thanks in advance!

Hi, I’m having the same problem. Did you manage to fix it? Android works fine, iPhone 6 plus renders half black screen, although both players are controllable, and iPad renders both okay, but the other way round from android and how I would want it.