Steps to reproduce:
1. Download the setup files (corridor-uaal.zip) and unarchive
2. The archive will contain a native iOS app project and a Unity project - follow the steps from https://github.com/Unity-Technologies/uaal-example/blob/master/docs/ios.md to set up the Unity project to work from native iOS app
3. Build the NativeiOSApp target to an iOS 11 device
4. Make sure the device is in Portrait orientation
5. Click 'Init' to load the Unity project
6. Wait up to a minute or two, the project will crash

Notes:
Does not reproduce when the game is built and ran directly on the devices, only reproduces when the game is launched from the native app.
Seems to only be reproducible when the game is running in Portrait orientation, tested multiple times in landscape - doesn't crash.

Reproduced with: 2019.4.22f1, 2020.3.2f1, 2021.1.0f1, 2021.2.0a11
Couldn't test with: 2018.4 (UAAL is not available)

Tested devices:
Reproduced:
VLNQA00201 iPad mini 4 (11.4) Dual-core 1.5 GHz Typhoon PowerVR GX6450 (quad-core graphics)
iPad Pro 12.9” (iOS 11.2.1)
iPhone SE (iOS 11.4.1)

iPad Air 2 (iOS 11.0.3)
iPad Air (iOS 11.0)

Not Reproduced:
iPad Mini 4 (iOS 13.0)
iPad Pro 12.9” (iOS 13.4.1)
iPhone 7 Plus (iOS 12.1.3)
iPhone 7 (iOS 13.1)
iPhone 6S (iOS 12.4.1)
iPhone XR (13.4.1)
iPhone 8 Plus (12.0)
iPad 9.7" 6th gen (14.4)