I recently "upgraded" my iPhone 13 Mini from iOS 18.7.3 to iOS 26.3. Now I'm finding that when I receive a new voicemail, a notification is displayed on the lock screen but the new voicemail doesn't appear in the phone app. I have to reboot the phone for the voicemail to show up. I'm using the "classic" layout. Is there a setting that I'm missing that would fix the problem?