Can I have multiple types of ControlWidget?

I am trying to add more than one ControlWidget in iOS 18 and I get an error and not sure whether I am doing anything wrong or there is a bug (or maybe it's not supported by design?)

I get the following error:

encountered an error: Error Domain=com.apple.dt.deviceprocesscontrolservice Code=8 "Failed to show Widget 'check.ios18-test.intent-ext-ui' error: Error Domain=FBSOpenApplicationServiceErrorDomain Code=1 "The request to open "com.apple.springboard" failed." UserInfo={NSLocalizedFailureReason=The request was denied by service delegate (SBMainWorkspace)., BSErrorCodeDescription=RequestDenied, NSUnderlyingError=0x600000cb7060 {Error Domain=SBAvocadoDebuggingControllerErrorDomain Code=2 "Please specify the widget kind in the scheme's Environment Variables using the key '_XCWidgetKind' to be one of: "

These are the two ControlWidgets I am trying to create:

struct GetPointIntent: AppIntent {
    static let title: LocalizedStringResource = "Get Point"

    func perform() async throws -> some IntentResult {
        return .result()
    }
}

struct LeftButton: ControlWidget {
    static let kind: String = "check.ios18-test.left"
    var body: some ControlWidgetConfiguration {
        StaticControlConfiguration(kind: Self.kind) {
            ControlWidgetButton(action: GetPointIntent()) {
                Label("Plus", systemImage: "arrowshape.left")
                Text("\(AppState.points)")
            }
        }
        .displayName("Left")
        .description("Left Move")
    }
}

struct RightButton: ControlWidget {
    static let kind: String = "check.ios18-test.right"
    var body: some ControlWidgetConfiguration {
        StaticControlConfiguration(kind: Self.kind) {
            ControlWidgetButton(action: GetPointIntent()) {
                Label("Plus", systemImage: "arrowshape.right")
            }
        }
        .displayName("Right")
        .description("Right Move")
    }
}

@main
struct intent_ext_uiBundle: WidgetBundle {
    var body: some Widget {
        RightButton()
        LeftButton()
    }
}

The app builds but upon running I get the mentioned error from Xcode