QLPreviewController is leaking on iOS 10

Hello,

I've the impression that QLPreviewController is leaking on iOS 10 (release version).

I've compiled the Apple DocInteraction sample, which push a QLPreviewController on a UINavigationController :

    QLPreviewController *previewController = [[QLPreviewController alloc] init];
    previewController.dataSource = self;
    previewController.delegate = self;
    [[self navigationController] pushViewController:previewController animated:YES];

When I pop the previewController, I can see with the new Xcode 8 object browser that there is still a leaving instance of a QLPreviewController.

If I subclass QLPreviewController:

@interface MYViewController : QLPreviewController
@end

@implementation MYViewController
- (void)dealloc {
}
@end

dealloc method is never called when the view controller is popped. With the same code on a iOS 8.1 simulator, dealloc is always called.

Can somebody confirms my investigation, or has any idea how to patch this leak ?

Thanks,

Jice