Created attachment 465132 [details] Memory Graph Screenshot Memory leaks (Malloc 32 Bytes x 4) when calling WKWebView.evaluateJavaScript passing a completion handler. Code example: extension ViewController: WKNavigationDelegate { func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) { webView.evaluateJavaScript("document.documentElement.scrollHeight", completionHandler: { (height, error) in self.webViewHeightConstraint?.constant = height as! CGFloat }) } } On the memory graph it is possible to see that it is on JavaScriptCore. Tested on iOS 16.2 and 16.0.1.