Face ID Not Working [Fixed. Please see the approved answer for details.]

I’ve reverted to 1P 7 and so far it seems to work just fine. It’s also just a more familiar experience overall compared to 1P8. If you’re having this issue I recommend downgrading until the developers get around to fixing this edge case issue. I don’t get the sense it’s a top priority fix for them since they make most of their money from enterprise customers who are in a much better position to simply swap their device than a normal user.