SwiftUI sheet dismiss warning

I wanted to add a dismiss button to a sheet on SwiftUI. Since I also want to control the presentation from code, I put the presented state in a view model. Here is a simplified version of the code:

final class ViewController: ObservableObject {
    @Published var showSheet: Bool = false
}

struct ContentView: View {
    
    @StateObject private var viewController = ViewController()
    
    
    var body: some View {
        Button("Show sheet") {
            viewController.showSheet = true
        }
        .padding()
        
        .sheet(isPresented: $viewController.showSheet, content: {
            MySheetView()
        })
    }
}

struct MySheetView: View {
    
    @Environment(\.dismiss) private var dismiss
    
    var body: some View {
        NavigationView {
            Text("Hello from the sheet")
            
                .toolbar {
                    ToolbarItem(placement: .navigationBarTrailing, content: {
                        Button("Dismiss") {
                            dismiss()
                        }
                    })
                }
        }
    }
}

If I use the dismiss button, I get the warning:

Publishing changes from within view updates is not allowed, this will cause undefined behavior.

just swiping down the sheet works fine.

Am I using something wrong here?

Xcode Version 14.0 (14A309)