How to take screenshot from WKWebView with embedded video ?

I want to take a screenshot with WKWebView contains a playing video. I tried many ways, it works well in Simulator, but on device the video's content is not captured.

Simulator:

Device:

I tried the following ways:

CALayer#render

let window = UIApplication.shared.windows.first { $0.isKeyWindow }
if window == nil { return }

let layer = window!.layer
let screenRect = window!.screen.bounds
UIGraphicsBeginImageContext(screenRect.size)
let ctx:CGContext = UIGraphicsGetCurrentContext()!
layer.render(in: ctx)
self.screenShotImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()

and

UIView#drawHierarchy

let window = UIApplication.shared.windows.first { $0.isKeyWindow }
if window == nil { return }

UIGraphicsBeginImageContextWithOptions(window!.frame.size, false, 0)
window!.drawHierarchy(in: window!.frame, afterScreenUpdates: true)
self.screenShotImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()

and

WKWebView#takeSnapshot

let config = WKSnapshotConfiguration()
config.rect = WKWebViewHolder.webView!.frame
config.afterScreenUpdates = false
webView.takeSnapshot(with: config, completionHandler: { (image: UIImage?, error: Error?) in
     if error != nil {
       return
     }
     self.screenShotImage = image
})

What should I do? 🤔