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The rollback path restored the .env backup with a suppressed file_put_contents() and an unchecked file_get_contents(). If the restore failed after the key had already been rotated, .env was left holding the new CI4 key while the DB still held CI3-era ciphertext, so the data became undecryptable after the next restart. Now the backup read is checked for false and the restore goes through the existing atomicWriteFile() helper; either failure throws so the error is surfaced instead of silently corrupting the config. Adds a regression test that forces an unreadable backup and asserts the throw plus that .env is left untouched.