CVMetalTextureCacheCreateTextureFromImage returning -6660

I've got a CVPixelBuffer frame coming from ARKit that I'm converting to BGRA and passing into Google's mediapipe framework. Mediapipe copies Gpu-buffered pixelbuffers into CVMetalTextureRefs as follows:

Code Block 
- (CVMetalTextureRef)copyCVMetalTextureWithGpuBuffer:(const mediapipe::GpuBuffer&)gpuBuffer plane:(size_t)plane {
	CVPixelBufferRef pixel_buffer = gpuBuffer.GetCVPixelBufferRef();
	NSLog(@"pixel_buffer: %@", pixel_buffer);
	
OSType pixel_format = CVPixelBufferGetPixelFormatType(pixel_buffer);
	MTLPixelFormat metalPixelFormat = MTLPixelFormatInvalid;
	int width = gpuBuffer.width();
	int height = gpuBuffer.height();
	switch (pixel_format) {
		case kCVPixelFormatType_32BGRA:
			NSCAssert(plane == 0, @"Invalid plane number");
			metalPixelFormat = MTLPixelFormatBGRA8Unorm;
			break;
		case kCVPixelFormatType_64RGBAHalf:
			NSCAssert(plane == 0, @"Invalid plane number");
			metalPixelFormat = MTLPixelFormatRGBA16Float;
			break;
		case kCVPixelFormatType_OneComponent8:
			NSCAssert(plane == 0, @"Invalid plane number");
			metalPixelFormat = MTLPixelFormatR8Uint;
			break;
		case kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange:
		case kCVPixelFormatType_420YpCbCr8BiPlanarFullRange:
			if (plane == 0) {
				metalPixelFormat = MTLPixelFormatR8Unorm;
			} else if (plane == 1) {
				metalPixelFormat = MTLPixelFormatRG8Unorm;
			} else {
				NSCAssert(NO, @"Invalid plane number");
			}
			width = CVPixelBufferGetWidthOfPlane(pixel_buffer, plane);
			height = CVPixelBufferGetHeightOfPlane(pixel_buffer, plane);
			break;
		case kCVPixelFormatType_TwoComponent16Half:
			metalPixelFormat = MTLPixelFormatRG16Float;
			NSCAssert(plane == 0, @"Invalid plane number");
			break;
		case kCVPixelFormatType_OneComponent32Float:
			metalPixelFormat = MTLPixelFormatR32Float;
			NSCAssert(plane == 0, @"Invalid plane number");
			break;
		default:
			NSCAssert(NO, @"Invalid pixel buffer format");
			break;
	}
	CVMetalTextureRef texture;
	CVReturn err = CVMetalTextureCacheCreateTextureFromImage(NULL, _gpuShared.mtlTextureCache, gpuBuffer.GetCVPixelBufferRef(), NULL, metalPixelFormat, width, height, plane, &texture);
	CHECK_EQ(err, kCVReturnSuccess);
	return texture;
}

For my ARKit-sourced YCbCr pixel buffers that I've converted to BRGA, (as opposed to test app BRGA images direct from an AVCaptureSession the CVMetalTextureCacheCreateTextureFromImage call is returning -6660, which is kCVReturnFirst, which is documented as a placeholder, and no methods are supposed to return it. Here's what one of my converted pixel buffers looks like (causes -6660 errors):

Code Block <CVPixelBuffer 0x2819cfde0 width=1440 height=1080 bytesPerRow=5760 pixelFormat=BGRA iosurface=0x0 attributes={
    IOSurfaceProperties =     {
        IOSurfaceCoreAnimationCompatibility = 1;
        IOSurfaceOpenGLESFBOCompatibility = 1;
        IOSurfaceOpenGLESTextureCompatibility = 1;
    };
    MetalCompatibility = 1;
    PixelFormatDescription =     {
        BitsPerBlock = 32;
        BitsPerComponent = 8;
        BlackBlock = {length = 4, bytes = 0x000000ff};
        CGBitmapContextCompatibility = 1;
        CGBitmapInfo = 8196;
        CGImageCompatibility = 1;
        ComponentRange = FullRange;
        ContainsAlpha = 1;
        ContainsGrayscale = 0;
        ContainsRGB = 1;
        ContainsYCbCr = 0;
        FillExtendedPixelsCallback = {length = 24, bytes = 0x0000000000000000acb43596010000000000000000000000};
        IOSurfaceCoreAnimationCompatibility = 1;
        IOSurfaceCoreAnimationCompatibilityHTPCOK = 1;
        IOSurfaceOpenGLESFBOCompatibility = 1;
        IOSurfaceOpenGLESTextureCompatibility = 1;
        OpenGLESCompatibility = 1;
        PixelFormat = 1111970369;
    };
} propagatedAttachments={
} nonPropagatedAttachments={
}>

And what one of the direct pixel buffers (working) looks like:

Code Block <CVPixelBuffer 0x2811681e0 width=1080 height=1920 bytesPerRow=4352 pixelFormat=BGRA iosurface=0x282264540 attributes={
    IOSurfaceProperties =     {
        IOSurfaceCoreAnimationCompatibility = 1;
        IOSurfaceOpenGLESFBOCompatibility = 1;
        IOSurfaceOpenGLESTextureCompatibility = 1;
    };
    MetalCompatibility = 1;
    PixelFormatDescription =     {
        BitsPerBlock = 32;
        BitsPerComponent = 8;
        BlackBlock = {length = 4, bytes = 0x000000ff};
        CGBitmapContextCompatibility = 1;
        CGBitmapInfo = 8196;
        CGImageCompatibility = 1;
        ComponentRange = FullRange;
        ContainsAlpha = 1;
        ContainsGrayscale = 0;
        ContainsRGB = 1;
        ContainsYCbCr = 0;
        FillExtendedPixelsCallback = {length = 24, bytes = 0x0000000000000000acb43596010000000000000000000000};
        IOSurfaceCoreAnimationCompatibility = 1;
        IOSurfaceCoreAnimationCompatibilityHTPCOK = 1;
        IOSurfaceOpenGLESFBOCompatibility = 1;
        IOSurfaceOpenGLESTextureCompatibility = 1;
        OpenGLESCompatibility = 1;
        PixelFormat = 1111970369;
    };
} propagatedAttachments={
    CVImageBufferColorPrimaries = "ITU_R_709_2";
    CVImageBufferTransferFunction = "ITU_R_709_2";
    CVImageBufferYCbCrMatrix = "ITU_R_601_4";
    MetadataDictionary =     {
        ExposureTime = "0.033281";
        NormalizedSNR = "14.08208347812393";
        SNR = "19.8742719209747";
        SensorID = 1044;
    };
} nonPropagatedAttachments={
}>

Any ideas what might be causing the -6660 return value or how to fix it?