CAEAGLLayer add to custom UIWindow cause memory leak after iOS13

I am working on a video project, using openGL to draw.
I want to add the view of the video to a new horizontal UIWindow when the video is full screen, and then return to the original UIWindow when it is turned back to half screen.

Code Block 
    UIViewController *landscapeVC = [[UIViewController alloc] init];
    
    UIWindow *landscapeWindow = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    landscapeWindow.windowLevel = 1000;
    landscapeWindow.hidden = NO;
    landscapeWindow.rootViewController = landscapeVC;
    [landscapeWindow addSubview: _playerView];
    [UIView animateWithDuration:[CATransaction animationDuration] animations:^{
        self.playerView.frame = landscapeWindow.bounds;
    }];

But at this time, I found that every time I rotate, the memory will rise, and not fall back.

I use XCode instruments for memory debugging, but Allocations shows that the video will fall back every time it returns to half screen.

I try to App back to the background, the memory will also be released.

I ruled out the memory leak of my code. Also found
The CAEAGLLayer object seems to have some relationship with UIWindow.

Code Block 
@interface CAEAGLLayer : CALayer <EAGLDrawable>
{
@private
  struct _CAEAGLNativeWindow *_win;
}

And the function *native_window_begin_iosurface()* called by IOSurface when it is created.

Does anyone know the principle of this.