NavigationSplitView detail view not updating

I have a NavigationSplitView with all three columns, and NavigationLinks in the sidebar to present different Lists for the content column. When a list item is selected in the content view, I want to present a view in the detail view. Since different detail views should be presented for different content views, I represent state like this (some details omitted for space):

// Which detail view to show in the third column
enum DetailViewKind: Equatable {
    case blank
    case localEnv(RegistryEntry)
    case package(SearchResult)
}

// Which link in the sidebar was tapped
enum SidebarMenuItem: Int, Hashable, CaseIterable {
    case home
    case localEnvs
    case remoteEnvs
    case packageSearch
}

// Binds to a DetailViewKind, defines the activate SidebarMenuItem
struct SidebarView: View {
    @State private var selectedMenuItem: SidebarMenuItem?
    @Binding var selectedDetailView: DetailViewKind
    
    var body: some View {
        VStack(alignment: .leading, spacing: 32) {
            SidebarHeaderView()
            Divider()
            // Creates the navigationLinks with a SidebarMenuRowView as labels
            SidebarMenuView(selectedMenuItem: $selectedMenuItem, selectedDetailView: $selectedDetailView)
            Spacer()
            Divider()
            SidebarFooterView()
        }
        .padding()
        .frame(alignment: .leading)
    }
}

struct SidebarMenuRowView: View {
    var menuItem: SidebarMenuItem
    @Binding var selectedMenuItem: SidebarMenuItem?
    @Binding var selectedDetailView: DetailViewKind
    
    private var isSelected: Bool {
        return menuItem == selectedMenuItem
    }
    
    var body: some View {
        HStack {
            Image(systemName: menuItem.systemImageName).imageScale(.small)
            Text(menuItem.title)
            Spacer()
        }
        .padding(.leading)
        .frame(height: 24)
        .foregroundStyle(isSelected ? Color.primaryAccent : Color.primary)
        .background(isSelected ? Color.menuSelection : Color.clear)
        .clipShape(RoundedRectangle(cornerRadius: 10))
        .navigationDestination(for: SidebarMenuItem.self) { item in
            navigationDestinationFor(menuItem: item, detailView: $selectedDetailView)
        }
        .onTapGesture {
            if menuItem != selectedMenuItem {
                selectedMenuItem = menuItem
            }
        }
    }

}

// Determines which detail view to present
struct DetailView: View {
    @Binding var selectedDetailView: DetailViewKind
    
    var innerView: some View {
        switch selectedDetailView {
        case .blank:
            AnyView(Text("Make a selection")
                            .font(.subheadline)
                            .foregroundStyle(.secondary)
                            .navigationSplitViewColumnWidth(min: 200, ideal: 350))
        case .localEnv(let regEntry):
            AnyView(EnvironmentDetailView(regEntry: regEntry))
        case .package(let searchResult):
            AnyView(PackageDetailView(searchResult: searchResult))
        }
    }
    
    var body: some View {
        innerView
    }
}

struct ContentView: View {
    @State private var detailView: DetailViewKind = .blank
    
    var body: some View {
        NavigationSplitView {
            SidebarView(selectedDetailView: $detailView)
                .navigationSplitViewColumnWidth(175)
        } content: {
            HomeView()
                .navigationSplitViewColumnWidth(min: 300, ideal: 450)
        }
        detail: {
            DetailView(selectedDetailView: $detailView)
            
        }
    }
}

My issue is that the detail view is not updated when the ContentView's detailView property is updated. I've verified that the value itself is changing, but the view is not. I searched around to see why this would be (this is my first Swift/SwiftUI application) and from what I gather a @Binding alone will not cause a view to be updated, that binding either needs to be used in the view hierarchy, or it needs to be stored as a @State property that gets updated when the binding value changes. I added a dummy @State property to DetailView and that still doesn't work, so I'm a little confused:

struct DetailView: View {
    @Binding var selectedDetailView: DetailViewKind
    @State private var dummyProp: DetailViewKind?
    
    var innerView: some View {
        switch selectedDetailView {
        case .blank:
            AnyView(Text("Make a selection")
                            .font(.subheadline)
                            .foregroundStyle(.secondary)
                            .navigationSplitViewColumnWidth(min: 200, ideal: 350))
        case .localEnv(let regEntry):
            AnyView(EnvironmentDetailView(regEntry: regEntry))
        case .package(let searchResult):
            AnyView(PackageDetailView(searchResult: searchResult))
        }
    }
    
    var body: some View {
        innerView.onChange(of: selectedDetailView) {
            dummyProp = selectedDetailView
        }
    }
}

Any ideas?