Does drawViewHierarchyInRect work with QLPreviewController?

I'm seeing an issue using [UIView drawViewHierarchyInRect:afterScreenUpdates:] to take an app "screenshot". Specifically, I'm seeing that a PDF rendered using QLPreviewController doesn't render in the screenshot when the code is run on a device.

I'm using this UIView API in conjunction with UIGraphicsBeginImageContextWithOptions and UIGraphicsEndImageContext - the simplified code is as follows:

UIWindow *appWindow = [[[UIApplication sharedApplication] delegate] window];

UIGraphicsBeginImageContextWithOptions(imageSize, NO, 1.0);
CGContextRef graphicsContext = UIGraphicsGetCurrentContext();

BOOL result = [appWindow drawViewHierarchyInRect:screenBounds afterScreenUpdates:NO];

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    
UIGraphicsEndImageContext();

and I'm setting up my QLPreviewController as follows:

- (void)pdfButtonTapped:(nonnull UIButton *)button {
    QLPreviewController *nextViewController = [QLPreviewController new];
    nextViewController.dataSource = self;
    [self presentViewController:nextViewController animated:YES completion:nil];
}

#pragma mark - QLPreviewControllerDataSource

- (NSInteger)numberOfPreviewItemsInPreviewController:(nonnull QLPreviewController *)controller {
    return 1;
}

- (nonnull id<QLPreviewItem>)previewController:(nonnull QLPreviewController *)controller previewItemAtIndex:(NSInteger)index {
    return [NSBundle.mainBundle URLForResource:@"menu_web_november" withExtension:@"pdf"];
}

I'm running this code on both device and simulator:

Device: iPad (6th generation), iOS 15.2 [Screen 1024x768] Simulator: iPad (9th generation), iOS 15.2, Xcode 13.2.1 (13C100) [Screen 1080x810]

The results I'm seeing differ between simulator and device.

On device, I see that only the navigation bar is rendered into the final image:

On simulator, I see that the full view (including the PDF) is rendered into the final image:

On both device and simulator, the result returned from the [UIView drawViewHierarchyInRect:afterScreenUpdates:] call is YES.

I'm capturing these screenshots by setting a breakpoint in the code after UIGraphicsEndImageContext(), choosing the image variable in the debug inspector and pressing the "eye" button but note that these are the results I see when running the code in release too.

I have a couple of questions about these results:

• Is it expected that QLPreviewController contents (for PDF at least) don't render in the snaphot image on device
• Is it expected that QLPreviewController contents (for PDF at least) do render in the snaphot image on simulator
• If this behaviour is expected, is there a way of telling which UIView subclasses are "compatible" with the [UIView drawViewHierarchyInRect:afterScreenUpdates:] API and which UIView subclasses won't render their contents in a snapshot?

Thanks for your help in advance,

Ceri