DynamicContainer assertion crash

[Kyle-Ye]

struct PhaseBugTestView: View {
    @State private var items = [6]

    var body: some View {
        VStack(spacing: 10) {
            ForEach(items, id: \.self) { item in
                Color.blue.opacity(Double(item) / 6.0)
                    .frame(height: 50)
                    .transition(.slide)
            }
        }
        .animation(.easeInOut(duration: 2), value: items)
        .onAppear {
            DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
                items.removeAll { $0 == 6 }
            }
        }
    }
}

After #700, the above example will crash due to OpenSwiftUICore/DynamicContainer.swift:372: Assertion failed