App is persisting keychain data after uninstall

[jvsena42]

The app Groups and Keychain DO persist between app uninstalls by default on iOS simulators and sometimes on physical devices. This is the likely cause:

Keychain Always Persists (from Apple Developer Forums):

• ALL keychain accessibility attributes (kSecAttrAccessibleAfterFirstUnlock, kSecAttrAccessibleWhenUnlockedThisDeviceOnly, etc.) control when data can be accessed, NOT whether it persists
• iOS intentionally preserves keychain data across app uninstalls for user convenience
• The ThisDeviceOnly suffix only prevents iCloud sync, not local persistence

App Group Containers on Simulators:

• On iOS simulators, App Group containers persist after app deletion
• On physical devices, App Group containers are supposed to be removed, but behavior can vary

[jvsena42]

https://developer.apple.com/forums/thread/36442