MusicKit subscription page crashes

Hi there,

It seems I'm getting crashes in the Apple Music subscription view sometimes. Couldn't figure out why.

crash_info_entry_0	_MusicKit_SwiftUI/MusicSubscriptionOffer.swift:73: Fatal error: Unexpectedly changed musicSubscriptionOffer's isPresented binding to true while internal presentation state is loading(MusicSubscriptionOffer.Options(messageIdentifier: .join, itemID: 331661274, affiliateToken: ....)).

It's important to note I am displaying it from UIKit ObjC and so I had to go through some hoops in order to get this to working.

Here's the relevant code:

//
//  MusicSubscriptionOfferView.swift
//

import Foundation
import MusicKit
import Combine
import SwiftUI

struct MusicSubscriptionOfferView: View {
    @StateObject var viewModel = MusicSubscriptionOfferViewModel()

    var body: some View {
        EmptyView()
            .musicSubscriptionOffer(
                isPresented: $viewModel.isShowingOffer,
                options: viewModel.offerOptions
            )
    }
}

class MusicSubscriptionOfferViewModel: NSObject, ObservableObject {
    @Published var isShowingOffer = false
    
    static var musicItemID: MusicItemID?
    var canBecomeSubscriber = false
    
    var offerOptions: MusicSubscriptionOffer.Options {
        get {
            var options = MusicSubscriptionOffer.Options()
            options.affiliateToken = "..."
            options.itemID = MusicSubscriptionOfferViewModel.musicItemID
            return options
        }
    }

    var subscriptions = Set<AnyCancellable>()
    
    override init() {
        super.init()
        Task {
            for await subscription in MusicSubscription.subscriptionUpdates {
                MyApp.sharedInstance().canBecomeSubscriber = subscription.canBecomeSubscriber
            }
        }
        NotificationCenter.default
            .publisher(for: NSNotification.Name(K_SHOW_APPLE_MUSIC_SUBSCRIPTION))
            .sink { [weak self] _ in
                self!.isShowingOffer = true
            }
            .store(in: &subscriptions)
    }
}

MusicSubscriptionOfferViewModel is initiated on launch, so MyApp.sharedInstance().canBecomeSubscriber receives a value upon launch.

and:

@objcMembers
final class MusicOfferProxyViewController: UIHostingController<MusicSubscriptionOfferView> {
    required init() {
        super.init(rootView: MusicSubscriptionOfferView())
    }
    
    @objc required dynamic init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

From the UIKit view controller:

        MusicKitInterop* musicKitObject = [[MusicKitInterop alloc] init];
        [self.view addSubview:musicKitObject.musicOfferProxyViewController.view];
        [self addChildViewController:musicKitObject.musicOfferProxyViewController];
        self.musicKitInterop = musicKitObject;

class MusicKitInterop: NSObject {
    
    var musicOfferVC: MusicOfferProxyViewController
    
    override init() {
        musicOfferVC = MusicOfferProxyViewController()
    }
    
    @objc func musicOfferProxyViewController() -> UIViewController {
        return musicOfferVC
    }
    
    @objc func canBecomeSubscriber() -> Bool {
        return MyApp.sharedInstance().canBecomeSubscriber
    }
}