SwiftUI PageTabView in iOS14.2 will Recall ChildView onAppear method Many times

I use TabView PageTabViewStyle with SwiftUI to display a pageview, when I swipe this TabView I find child view will Recall onAppear method Many times, Can someone tell me why?

This is my code

Code Block 
import SwiftUI
struct Pageview: View {
    
    @StateObject var vm = PageViewModel()
    
    var body: some View {
        VStack {
            
            DragViewBar().padding(.top, 14)
            
            TabView(selection: $vm.selectTabIndex) {
                
                TextView(index: "0").tag(0)
                TextView(index: "1").tag(1)
                TextView(index: "2").tag(2)
                TextView(index: "3").tag(3)
                TextView(index: "4").tag(4)
                TextView(index: "5").tag(5)
                
            }
            .tabViewStyle(PageTabViewStyle(indexDisplayMode: .never))
            
        }
    }
}
struct TextView: View {
    
    let index: String
    
    var body: some View {
        VStack {
            Text(index)
        }
        .onAppear { print(index) }
        
    }
}
struct DragViewBar: View {
    var body: some View {
        Rectangle()
            .frame(width:36.0,height:5.0).foregroundColor(Color.blue)
            .cornerRadius(100)
    }
}
class PageViewModel: ObservableObject {
    @Published var selectTabIndex = 0
}

When I swipe this Tabview, The result of the console printing

Code Block 
0
0
0
0
0
0
0
0
0
0
0
1
2
1
1
1
1
1
1
2
0
0
0
0
0
0
2
1
1
1
1
1
1
2

The correct case is to print only once per swipe
It just has a problem in ios14.2, 14.1 will be ok, you can load my code in Github: https://github.com/werbhelius/TabViewBug

Xcode version: 12.1 (12A7403)

Device: iPhone 6s iOS 14.2

I think you can reproduce this problem on any device in iOS 14.2

I look forward to your help to solve this problem. Thank you