Context: We’re using a WKWebView in our app, and the HTML content includes a custom font-family. No additional fonts are injected into the WKWebView from the native side. When selecting content within the HTML and interacting with the selected text—such as clicking on it—the app crashes. However, on the same MacBook, the app may crash intermittently even without any code changes. In my case, the crash used to occur, but after recovering the custom font-family it no longer happens. And the other colleagues has never had this crash. We have the same MacOS & App version and the same testing methods were used.