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.