I have a shipping Mac App Store App supporting macOS 10.9 and above. In several places inside the App I show a Google Map inside a WebView. I'm testing my App in macOS 10.15 Beta5 (19A526h) and none of the WebView's are working. The Webview shows a blank white canvas and there are no errors reported in the XCode console, nor in the machine console, nor any WebView delegate error callbacks. The WebView delegate callbacks all report that the URL was loaded successfully, just nothing shows up on the screen.
The same binary works fine in 10.14 but does not work in 10.15 Beta. Built using Xcode 10.2.1 or 10.3 using macOS 10.14 SDK.
Does this sound like a bug that should be filed? Or am I running into a security change I don't yet know about?
(Yes, I know that WebView has been deprecated in favour of WKWebView but it should still work)
