iOS Critical Notifications # Unable to open the app from push notification (iPhone 12 - iOS 15.4.1)

Question

1. Our app equipped with critical notifications support and play custom sound (siren) for critical events - https://medium.com/@shashidharyamsani/implementing-ios-critical-alerts-7d82b4bb5026
2. Everything works well if user enable both "Allow notifications", "Critical Alerts" toggles in iPhone settings.
3. iPhone receives critical notifications
4. But unable to open the app from push notification, if user enable only "Critical Alerts" as shown in below screenshot

Refer attached image for - iPhone Settings

5. We assume iOS system not allowing to open the notifications as ‘Allow notifications' option for the app is disabled from iPhone settings.

Not sure whether this is expected behavior or an issue.

Please let us know if anyone supporting the critical alerts feature and encounter the same issue.

Thanks in advance...