Popover does not appear when closed during variable edit

I want to edit objects using popovers in my macOS application. But for some reason the popover does not appear anymore, when it was closed the popover while editing a variable. In the example bellow i've used a TextField to do that, but same happens with a DatePicker. (see gif bellow)

Any ideas, why this is happening?

https://gifyu.com/image/IF2i

import SwiftUI

struct ContentView: View {
  var body: some View {
  VStack {
  SubView()
  SubView()
  SubView()
  }.padding()
  }
}

struct SubView: View {
  @State var showPopover = false
  var body: some View {
  VStack {
  Text("Label")
  }.onTapGesture {
  self.showPopover = true
  }
  .popover(isPresented: $showPopover, arrowEdge: .trailing) {
  Popover()
  }
  }
}

struct Popover: View {

  @State var test: String = ""

  var body: some View {
  TextField("Text", text: $test)
  }
}