WKWebView iOS 8.4 memory leak

Question

WKWebview memory leak on iOS 8.4 . It can be detected using tools (leaks). When we check the stack trace , it indicates the initialization of WKWebView.

webView = [[WKWebView alloc] initWithFrame:_displayView.frame];

If we drill down, we can understand that the UIWebSelectionAssistant and _UIKeyboardTextSelectionGestureController stand out, but have never been released.

Since they are called internally by WKWebView, I don't know how to release them. Although I use ARC, but still I wrote them in the dealloc method:

[webView stopLoading];
webView.navigationDelegate = nil;
[webView removeFromSuperview];
webView = nil;

However, I still cannot escape the leaks. More details can be found in the attached screenshot. Link to leak screenshot

Thank!