Application is in foreground state, When a user receives a cellular call and it is in the "ringing" state and application receives a VoIP APNS(video call) which is reported to CallKit.
User rejects the Cellular call from CallKit UI, application Video call is also getting rejected (separate feedback - 19017978) and Here the issue is observed that an Application moved to background.
Issue is not observed in iOS 18 and older versions.
Issue observed only with UISceneDelegate changes. Using traditional UIApplicationDelegate doesn't have the issues.
Video and Sysdiagnose logs are added in feedback: FB20187309