Reproduction steps:
1. Open attached project 'Project.zip'
2. Run 'Build.ps1' file
3. Open generated solution in 'Builds' folder
4. In Visual Studio, build and run using 'Debug', 'x86' and 'Local Machine'
5. Once Build opens, in Visual Studio, observe

Expected result: No exceptions
Actual result: Unhandled Ill2CppException

Reproducible with: (1.0.21) 2018.4.26f1, 2018.4.32f1
Not reproducible with: (1.0.21) 2018.4.16f1, 2018.4.25f1, (4.2.3) 2019.4.17f1
Could not test with: 2020.2.2f1, 2021.1.0b1 (compilation errors)

Notes:
1. The UWP IL2CPP platform for Unity and Universal Windows Platform Workload for Visual Studio are required.
2. To reproduce, adjust the Editor installation folder in Build.ps1, line 20
3. Removing "com.unity.xr.windowsmr.metro": "1.0.21"' from Packages/manifest.json fixes the issue.