Markers never detected on iOS and iPhone X screen cut off?

I just built a Vuforia project targeting Android and iOS using 2018.1.0b12. Running in the editor works fine as well as on an Android device. The iOS build however recognises no targets at all. In addition to that it doesn't fill the whole iPhone X screen but has black borders on top and under the camera view, looks like 3.5" screen with rounded corners (I have not actually measured it though).

Is this the same issue that is described here: https://forum.unity.com/threads/kno...xcode-9-3-and-ios-11-3-beta-arkit-1-5.516117/ ?

Or is this an issue related to the beta itself? I'm using the Vuforia module that comes with Unity.

I have tried building with btoth Xcode 9.2 and 9.3 with the same result.