Control center apps disappeared after iOS update

iOS updates generally aim to enhance user experience, boost security, and fix bugs rather than disrupt core features. Alarm issues after updates might stem from underlying, unmentioned factors. Updates won't typically alter personal data but may refine settings or features. Backup before major updates for safety. Review Apple's update details and backup advice for a smooth process.

This seems purely coincidental so please check the Setting on your device.

See what each update does: About iOS 17 Updates, About iOS 16 Updates, About iOS 15 Updates, About iOS 14 Updates, About iOS 13 Updates, About iOS 12 Updates, and so on...

Control Center disappeared from Apple Watch after update. How is this resolved?

Please see: Use Control Center on Apple Watch - Apple Support