Application crashing with on file Swift/ContiguousArrayBuffer.swift Xcode 12, iOS 14, SwiftUI

The app I'm currently building works perfectly fine on iOS 13 but crashes most of the times when I click on picker view that is shown using ZStack with the error.

Fatal error: Index out of range: file Swift/ContiguousArrayBuffer.swift, line 444

The crash occurs most of the times and I am unable to find the problem.

Has anyone encountered the same issue or could anyone tell me whats causing this only in iOS 14? Thanks

While replicating the similar code in a demo app, it seems to run fine most of the times and crashes rarely. Below is the code for the demo app.

struct ContentView: View {
    @State var showPicker = false
    @State var selectedIndex = 0
    @State var pickerValues: [String] = []
    @State var selectedValue = ""
    var body: some View {
        ZStack() {
            VStack() {
                if !pickerValues.isEmpty {
                    Text(selectedValue)
                        .padding()
                }
                Button {
                    self.pickerValues = [
                        "First Element",
                        "Second Element",
                        "Third Element",
                        "Fourth Element",
                        "Fifth Element",
                        "Sixth Element",
                        "Seventh Element"
                    ]
                    self.showPicker.toggle()
                } label: {
                    Text("Show Picker")
                }

            }

            if showPicker {
                AppPickerView(title: "Picker", data: self.pickerValues, selectedData: self.$selectedValue, show: self.$showPicker)
            }
        }
    }
}

struct AppPickerView: View {
    var title: String
    var data: [String]
    @Binding var selectedData: String
    @Binding var show: Bool
    @State var showAnimation: Bool = false

    var body: some View {
        ZStack {
            Color.init(#colorLiteral(red: 0, green: 0, blue: 0, alpha: 0.3980798856))
            VStack() {
                Text(title).font(.system(size: 20))
                    .fontWeight(.semibold)
                    .padding()
                picker.animation(nil)
                cancelAndSelect.animation(nil)
            }
                .background(Color.white)
                .cornerRadius(12)
                .padding()
                .transition(.opacity)
                .offset(x: 0, y: showAnimation ? 0 : 50)
                .opacity(showAnimation ? 1 : 0)
                .animation(Animation.easeOut(duration: 0.25))
                .edgesIgnoringSafeArea(.all)
        }.onAppear() {
                self.showAnimation = true
        }

    }

    var picker: some View {
        Picker(selection: $selectedData, label: Text(""),
            content: {
                ForEach(data, id: \.self) { (string: String) in
                    Text(string)
                }
            }).pickerStyle(WheelPickerStyle())
            .labelsHidden()
            .frame(height: 150)
    }

    var datePicker: some View {
        Picker(selection: $selectedData, label: Text(""),
            content: {
                ForEach(data, id: \.self) { (string: String) in
                    Text(string)
                }
            }).pickerStyle(WheelPickerStyle())
            .labelsHidden()
            .frame(height: 150)
    }

    var cancelAndSelect: some View {
        HStack() {
            Button(action: {
                self.hideAppPicker()
            }) {
                Text("Cancel")
            }.buttonStyle(BackButtonStyle())

            Button(action: {
                self.hideAppPicker()
                print(self.selectedData)
            }) {
                Text("Ok")
            }.buttonStyle(ForwardButtonStyle())
        }
        .frame(height: 50)
            .padding(.all, 10)
    }

    func hideAppPicker() {
        self.showAnimation = false
        self.show.toggle()
    }

    func selectInitalData() {
        if let firstElement = self.data.first, self.selectedData.isEmpty {
            self.selectedData = firstElement
        }
    }
}
struct BackButtonStyle: ButtonStyle {
    func makeBody(configuration: Self.Configuration) -> some View {
        configuration.label
            .foregroundColor(.primary)
            .frame(maxWidth: .infinity)
            .frame(height: 40)
            .background(Color.secondary)
            .cornerRadius(20)
            .shadow(color: Color.secondary.opacity(0.4), radius: 5, x: 2, y: 2)

    }
}

struct ForwardButtonStyle: ButtonStyle {
    func makeBody(configuration: Self.Configuration) -> some View {
        configuration.label
            .frame(maxWidth: .infinity)
            .frame(height: 40)
            .foregroundColor(.white)
            .background(Color.primary)
            .scaleEffect(configuration.isPressed ? 0.95 : 1)
            .opacity(configuration.isPressed ? 0.5 : 1)
            .cornerRadius(20)
            .shadow(color: Color.primary.opacity(0.4), radius: 5, x: 2, y: 2)
    }
}

struct SecondaryButtonStyle: ButtonStyle {
    func makeBody(configuration: Self.Configuration) -> some View {
        configuration.label
            .frame(maxWidth: .infinity)
            .frame(height: 40)
            .background(Color.white)
            .cornerRadius(20)
            .scaleEffect(configuration.isPressed ? 0.95 : 1)
            .opacity(configuration.isPressed ? 0.5 : 1)
            .overlay(Capsule().stroke(Color.primary, lineWidth: 1))
            .shadow(color: Color.secondary.opacity(0.4), radius: 5, x: 2, y: 2)
    }
}