The console displays "Failed to parse font key token"

Failed to parse font key token is displayed at console. It doesn't particularly cause crashes, UI bugs, etc., but it is a concern.

This is occurred when I zoom on SwiftUI Map.

Part of code

struct MapView: View {
 var body: some View {
    Map(coordinateRegion: $viewModel.region,
      showsUserLocation: true,
      annotationItems: viewModel.pins,
      annotationContent: { item in
      MapAnnotation(coordinate: item.coordinate, anchorPoint: CGPoint(x: 0.5, y: 0.5), content: {
        pinButton(pin: item)
      })
    })
    .ignoresSafeArea()
  }
}

My project is here.