Prevent dismissal of sheet in SwiftUI

I'd like to emulate the behavior of UIViewController.isModalInPresentation in SwiftUI. In my first attempt, I defined the following view:

Code Block 
struct ModalView<Content: View>: UIViewControllerRepresentable {
		var content: () -> Content
		func makeUIViewController(context: Context) -> UIHostingController<Content> {
				let controller = UIHostingController(rootView: content())
				controller.isModalInPresentation = true
				return controller
		}
		func updateUIViewController(_ imagePickerController: UIHostingController<Content>, context: Context) {}
}

From my main app view, I then present the ModalView as a sheet:

Code Block 
struct ContentView: View {
		@State
		var presentSheet: Bool = true
		var body: some View {
				Text("Hello, world!")
						.sheet(isPresented: $presentSheet) {
								ModalView {
										Text("Sheet")
								}
						}
		}
}

But the user is still able to dismiss the ModalView by swiping down. I would expect this sheet to be non-dismissible. Is anything like this supposed to work? If not, is there some other way to prevent the dismissal of a sheet in SwiftUI?

The closest workaround I've found is to apply .highPriorityGesture(DragGesture()) to the content of the sheet, but swiping down with two fingers still works.