In my Mac OSX app Am loading HTML from local file system (file:// URL) but on OSX Catalina it show a blank white screen, it works in fine in previous Mac versions.
It works fine in Debug or Release mode so prob a setting when it get signed for AppStore submissions.
I've also had local file issues in the original 10.15 build release, I've "heard" it is fixed in build 19A603 (released yesterday 10-21-2019), but personally have not verified that...
Note: Other Xcode devs have also reported this issue on beta and production versions (i.e. not an Xamarin related issue)
Apple Developer Forums: https://forums.developer.apple.com/thread/120248
