This issue was addressed with improved data access restriction. This issue is fixed in visionOS 2.4, iOS 18.4 and iPadOS 18.4, iPadOS 17.7.6. Sensitive keychain data may be accessible from an iOS backup.
https://cyberscoop.com/apple-security-update-march-2025/
https://support.apple.com/en-us/122378
https://support.apple.com/en-us/122372
https://support.apple.com/en-us/122371
http://seclists.org/fulldisclosure/2025/Apr/5