A logic issue was addressed with improved state management. This issue is fixed in macOS Monterey 12.1, watchOS 8.3, iOS 15.2 and iPadOS 15.2, tvOS 15.2. User traffic might unexpectedly be leaked to a proxy server despite PAC configurations.
https://support.apple.com/en-us/HT212980
https://support.apple.com/en-us/HT212978