Unable to disable wkwebview's scrolling in iOS 13 beta

I want to disable wkwebview's scrolling like this "WKWebView.scrollView.scrollEnabled = NO", but it is not working in iOS13 Beta.

here is my code:

- (WKWebView *)webView{

if (_webView == nil) {

WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init];

_webView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:configuration];

_webView.scrollView.scrollEnabled = NO;

_webView.navigationDelegate = self;

}

return _webView;

}