How to use .widgetURL?

I have a widget that shows one "event" at a time, so you can have as many copies of the widget as you like, each one showing a different event. This all works fine.

I'm trying to get the main app to open onto a specific page when the user taps a specific widget. For example, the user taps the "Birthday" widget, and the app should show the Birthday page.

In my widget view, I have this on the View object:

Code Block swift
.widgetURL(URL(string: "widget_PreviewEvent:" + event.name))

This sends the text "widget_PreviewEvent:Birthday" to the app. The App's delegate implements the method:

Code Block 
application:openURL:options:

I have it logging this out:

Code Block 
Delegate: openURL: url = 'widget_PreviewEvent:Birthday'
Main view: showScreen: 'widget_PreviewEvent:Birthday'
Found eventName from url = 'Birthday'

Right, so that works fine. I can tell the app to open the Birthday event, and it does.

However, sometimes, and especially more so on the medium widget, this method is called instead:

Code Block 
application:continueUserActivity:restorationHandler:

and the userActivity object is this:

Code Block 
userActivity = DynamicEventSelectionIntent, userActivity.userInfo = {
    WGWidgetUserInfoKeyFamily = systemMedium;
    WGWidgetUserInfoKeyKind = "com.company.product.widget"; /* example */
}

"Birthday" isn't mentioned in that object anywhere, so I can't open the Birthday event. How do I fix this?

Code Block swift
let activity: NSUserActivity = NSUserActivity.init(activityType: "ViewEventIntent")
func updateEventToOpenInMainApp(event: EventDetail) -> URL! {
	activity.title = "widget_PreviewEvent:"
	activity.userInfo = ["widget_PreviewEvent:" : event.name]
	activity.becomeCurrent()
	return URL(string: "widget_PreviewEvent:" + event.name)
}

Code Block swift
struct MyWidgetView: View {
	var event: EventDetail /* This object contains the name of the event */
	var body: some View {
      ZStack {
          GeometryReader { g in
              Link(destination: updateEventToOpenInMainApp(event: event)) {
                  HStack {
                      ...
                  } /* HStack */
                  .widgetURL(updateEventToOpenInMainApp(event: event))
              } /* Link */
          } /* GeometryReader */
      } /* ZStack */
   }
}