Reproduction steps:
1. Open the attached project "ReproProj"
2. Open the “/Assets/Scenes/SampleScene.unity” Scene
3. Enter the Play Mode
4. Press the “Space“ key on the keyboard (“A“ button on Quest controller if testing with Mock Runtime disabled)

Expected result: Editor does not crash and continues to run
Actual result: Editor crashes

Reproducible with: 6000.0.6f1, 6000.0.26f1, 6000.1.0a1
Not reproducible with: 2022.3.51f1, 6000.0.5f1, 6000.1.0b3
Fixed in: 6000.1.0a2
Could not test with: 2021.3.45f1 (Assets\FoveaTest.cs(51,63): error CS1061: 'XRDisplaySubsystem' does not contain a definition for 'foveatedRenderingFlags' and no accessible extension method 'foveatedRenderingFlags' accepting a first argument of type 'XRDisplaySubsystem' could be found)

Reproducible on:
Play Mode (Mock Runtime) (VLNQA00379, Oculus (Quest 2), Android 10, CPU: Snapdragon XR2, GPU: Adreno (TM) 650)
Play Mode (Quest Pro) (user reported)
Windows Standalone Player (Mock Runtime) (VLNQA00379, Oculus (Quest 2), Android 10, CPU: Snapdragon XR2, GPU: Adreno (TM) 650)

Not reproducible on:
Play Mode (Android Platform)
Android Player (VLNQA00379, Oculus (Quest 2), Android 10, CPU: Snapdragon XR2, GPU: Adreno (TM) 650)

Testing environment: Windows 10 Enterprise 21H2
Not reproducible on: No other environment tested

First few lines of the Stacktrace:
UnityEngine.Debug:ExtractStackTraceNoAlloc (byte*,int,string)
UnityEngine.StackTraceUtility:ExtractStackTrace ()
UnityEngine.DebugLogHandler:Internal_Log (UnityEngine.LogType,UnityEngine.LogOption,string,UnityEngine.Object)
UnityEngine.DebugLogHandler:LogFormat (UnityEngine.LogType,UnityEngine.Object,string,object[])
UnityEngine.Logger:Log (UnityEngine.LogType,object)

Notes:
- Reproducible with DX12, but does not reproduce with DX11
- Does not reproduce with Vulkan and OpenGLES3