StereoKit: HoloLens graphics crash

Description

From Christoph on Discord:

Recently encountered this weird error when starting the app. Any idea what could cause this? It happens very rarely but always appears right after starting the app and when SK is already running. It seems like the frames don’t get cleared but just draw on top of each other. We are running some asynchronous code (specifically request permissions https://learn.microsoft.com/hu-hu/uwp/api/windows.security.authorization.appcapabilityaccess.appcapability.requestaccessforcapabilitiesasync?view=winrt-22621&viewFallbackFrom=winrt-14393) between SK.Initialize and SK.Run, could this have anything to do with it? Possibly looks related to this issue: https://github.com/StereoKit/StereoKit/issues/361

Platform / Environment

UWP/HoloLens 2

Logs or exception details

Here’s some abbreviated logs

[SK info] [RequestAccess::GetNativeCapabilities] Requesting eye gaze permission.
[SK info] [RequestAccess::GetNativeCapabilities] Requesting webcam permission.
[SK info] [RequestAccess::GetNativeCapabilities] Requesting microphone permission.
[SK info] [RequestAccess::GetInternalCapabilities] Requesting qr code permission.
[SK info] [RequestAccess::GetInternalCapabilities] Requesting research mode permission.
[SK info] [RequestAccess::GetCapabilites] All native capabilities passed: True.
[SK info] [RequestAccess::GetCapabilites] All internal capabilities passed: True.
[SK error] sk_gpu: CreateBuffer failed!
[SK error] sk_gpu: Create texture error!
[SK error] mesh_set_inds: Failed to create dynamic index buffer
[SK error] sk_gpu: Create Shader Resource View error!
[SK error] sk_gpu: CreateBuffer failed!
[SK error] mesh_set_verts: Failed to create dynamic vertex buffer
[SK error] sk_gpu: CreateBuffer failed!
[SK error] mesh_set_verts: Failed to create vertex buffer
[SK error] sk_gpu: CreateBuffer failed!
[SK error] mesh_set_verts: Failed to create vertex buffer
[SK error] sk_gpu: CreateBuffer failed!
[SK error] mesh_set_verts: Failed to create vertex buffer

And pseudocode for the application flow

static void Main(string[] args)
{
    SKSettings settings = new()
    {
        appName = applicationName,
        assetsFolder = "Assets",
    };
    Task someTask = doSomeTask();

    if (!SK.Initialize(settings))
        Environment.Exit(1);
    
    Action onComplete = async () =>
    {
        await someTask;
        SK.AddStepper<Menu>();
    };

    RequestAccess access = new(onComplete);
    SK.AddStepper(access);

    SK.Run();
}

class RequestAccess : IStepper
{
    private Action onComplete;
    RequestAccess(Action onComplete)
    {
        this.onComplete ??= onComplete;
    }

    public void Step()
    {
        switch (State)
        {
            case MenuState.RequestCapabilities:
                State = MenuState.RequestingCapabilities;
                // Run the async task without await so that it runs on another worker thread, separate from
                // the SK initialization/stepper thread (which has async Asset creation in https://github.com/StereoKit/StereoKit/issues/361)
                _ = this.GetCapabilites(); // run async task
                break;
            case MenuState.RequestingCapabilities:
                break; // do nothing
            case MenuState.PermissionsMenu:
                this.PermissionsMenu(); // show missing permissions UI
                break;
            case MenuState.Shutdown:
                SK.RemoveStepper(this);
                this.onComplete?.Invoke(); // add other steppers
                break;
        }
    }
}

class Menu : IStepper
{
    bool Initialize()
    {
        someSprite = Sprite.FromFile("some.png", SpriteType.Single);
        return true;
    }
}