iOS 27 Beta 5: Button actions ignored inside horizontal SwiftUI ScrollView (minimal repro)

On iOS/iPadOS 27 Beta 5 (24A5408d), I can consistently reproduce SwiftUI Button actions being ignored when the buttons are placed inside a horizontal ScrollView near the top of a view. This occurs on physical iPhone and iPad devices and on an iPhone 16 Simulator. Equivalent UI was reliable on the preceding beta.

Minimal shape:

struct ContentView: View {
    @State private var selection = "All"

    var body: some View {
        NavigationStack {
            VStack(spacing: 0) {
                ScrollView(.horizontal, showsIndicators: false) {
                    HStack {
                        ForEach(["All", "Food", "Transport"], id: \.self) { item in
                            Button(item) {
                                selection = item
                            }
                            .padding()
                        }
                    }
                }

                Text("Selected: \(selection)")
                Button("Control below") { selection = "Control" }
                Spacer()
            }
            .navigationTitle("Touch Hit-Test Repro")
            .navigationBarTitleDisplayMode(.inline)
        }
    }
}

The standalone reproducer includes an XCUITest comparison. Results on the iOS 27 Beta 5 iPhone 16 Simulator:

• Horizontal ScrollView: fails; the chip is reported as hittable but tap() does not invoke its action.
• Remove .searchable: still fails.
• Remove the sheet: still fails.
• Remove only the horizontal ScrollView: passes.
• Tap a normal button below the strip: passes.

Final result: 3 failed, 2 passed. This points to a Beta 5 hit-testing or gesture arbitration regression involving Button inside a horizontal ScrollView, rather than application state or a transparent overlay.

Feedback filed: FB24307724

Has anyone found a framework-level workaround that preserves both native button semantics and horizontal scrolling? Related historical reports include https://developer.apple.com/forums/thread/763436 and https://developer.apple.com/forums/thread/794212.