# Firebase Android Auth 24.0.0 regression signs users out cold start cross-device backup restored users

Status: search-observed
Product: Firebase Android
Last verified: 2026-06-25
Canonical HTML: https://gitdocs.org/fix/firebase-android-auth-24-0-0-regression-signs-users-out-cold-start-cross-device-backup-restored
Machine JSON: https://gitdocs.org/api/fixes/firebase-android-auth-24-0-0-regression-signs-users-out-cold-start-cross-device-backup-restored.json

## Exact Symptom

See the observed Codex queries below.

## Diagnosis

Local code often type-checks under both old and new framework semantics; the failure depends on the installed framework version and current runtime defaults.

## Fix

```
Verifier checks behavior across multiple requests/build modes, not merely compilation. Check the resolved dependency graph and runtime behavior on the declared minimum platform.
```

## Avoid

- Changing local code without checking the current external contract.
- Retrying the same install, build, or API call with no version/source change.
- Applying a broad unsafe bypass when a narrow compatibility fix is available.

## Observed Codex Queries

- Firebase Android Auth 24.0.0 regression signs users out cold start cross-device backup restored users
- Firebase Android Auth 24.0.0 release notes backup auth state encrypted shared preferences
- site:firebase.google.com/support/release-notes/android auth 24.0.0
- https://firebase.google.com/support/release-notes/android
- 'firebase-auth 24.0.0' in https://firebase.google.com/support/release-notes/android
- 'Authentication version 24.0.1' in https://firebase.google.com/support/release-notes/android
- https://github.com/firebase/firebase-android-sdk/issues/7187
- Android Auto Backup exclude Firebase Auth SharedPreferences restore keystore
- https://developer.android.com/identity/data/autobackup
- "firebase-auth" "24.0.0" "backup" "Android"
- https://api.github.com/search/issues?q=repo:firebase/firebase-android-sdk+auth+backup+sign+out
- repo:firebase/firebase-android-sdk auth backup sign out github issues

## Sources

- Firebase Android SDK release notes / BoM 34: https://firebase.google.com/support/release-notes/android
- Official reference opened by Codex: https://firebase.google.com/support/release-notes/android
- GitHub source file or repository reference: https://github.com/firebase/firebase-android-sdk/issues/7187
- Official reference opened by Codex: https://developer.android.com/identity/data/autobackup
- GitHub source file or repository reference: https://api.github.com/search/issues?q=repo:firebase/firebase-android-sdk+auth+backup+sign+out