Created attachment 261025 [details]
Sample app that repros this bug
Steps to Reproduce:
1) Run the attached code
2) Click on "wv1", that creates a WKWebView and loads a webpage
3) Click on "clear cookies", that uses the WKWebsiteDataStore API to clear cookies
4) Click on rc, that injects JS to retrieve the cookies from a web page.
The completionHandler (from the JS eval method) is called.
The completionHandler (from the JS eval method) is never called.
s/does evaluate/does not evaluate in the description.
Sorry for the typo.