SwiftUI .fileImporter does not react to isPresented change.

I made a ImagePicker which worked pretty well. But when app get bigger it stops. Does not react to change isPresented value. As far I know I changed nothing around this part of an App. Also same thing happened in different place, another kind of picker.

print ("HELL'o") never prints. Silence.

struct ImagePicker: View {
    @Binding var imageSource: ImageSource 
    @State var showFileImporter: Bool = false
    @EnvironmentObject var manager: Manager

    var body: some View {
        VStack {
            ....
            Button(action: {
                print("before", showFileImporter)
                showFileImporter = true
                print("after", showFileImporter)
                   },
                   label: { Text("open Image") })
                .buttonStyle(.borderless)
                .controlSize(.mini)
                
        }.fileImporter(isPresented: $showFileImporter,
                       allowedContentTypes: [.png, .jpeg, .tiff],
                       onCompletion: { result in
            print ("HELL'o") // Never prints
            switch result {
            case let .success(url):

                guard let _ = try? Data(contentsOf: url) else { return }
               ....          
            case let .failure(error):
                print(error)
            }
        })
    }
}

Does anybody have an idea what happened? I suspect some settings in completely different palce or bug or computer does not like me.