It's really a shame that they sell the game (€80) and one of its MAIN functions doesn't work.
But the worst of all is that it doesn't seem like they are going to fix it, I don't see anything on Twitter, YouTube, or anywhere, only here and on reddit.
We send them bug reports and we all request it from Larian (there are many of us with this problem) they have to be aware of this and they do nothing.
The game is a 10, but unplayable in split screen, I will request a refund without much hope.