In my case I found an easy solution:
Xcode > Settings... > General:
Deactivate: Show live issues
All error appeared which before were gone.
wilm
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
Post
Replies
Boosts
Views
Activity
I had exactly the same problem with macOS 10.15 Beta5. Neither @ObservableObject nor @EnvironmentObject in a View (SwiftUI) worked. Changing a parameter in the observed object (or environment object) and sending the message from its objectWillChange Publisher did not result in updating the View.I could solve this problem in my code with one single line:adding "let objectWillChange: ObservableObjectPublisher = ObservableObjectPublisher()" to the observed object (environment object).Even though there is a default implementation of this variable after adding "ObservableObject" protocol declaration it seems not to work properly. After adding this line everything worked as expected. Before no message ever reached the subscribers.