Different UIView inside TabView

Question

I have created a TabView and use PageTabViewStyle() to display different UIViews.

Here is the code:

var body: some View {
        GeometryReader { g in
            TabView() {
                ForEach(0..<imageNames.count) { index in
                    TextInfoView(imageName: imageNames[index],
                                 text: texts[index],
                                 title: titles[index],
                                 titleSymbol: titleSymbols[index])
                }
                ContactView() // <-- another view 
            }.tabViewStyle(PageTabViewStyle())
            .indexViewStyle(PageIndexViewStyle(backgroundDisplayMode: .always))
            .navigationTitle(pageTitle)
        }
    }

The TextInfoView is just a view for displaying information with images and text.

When I add another View that is "ContactView()" another customView with some images and text, I receive the following warnings:

2021-04-01 23:39:54.581457+0800 Metal API Validation Enabled

What this message mean?

Note that my ContactView() has a MKMapView() there. If I remove the MKMapView(), then there is no such error.