If the logs are not pruned then latest log backup gets mounted, if logs are pruned then log backup immediately after the data backup is mounted. Without pruning enabled SCO considers that the latest l...If the logs are not pruned then latest log backup gets mounted, if logs are pruned then log backup immediately after the data backup is mounted. Without pruning enabled SCO considers that the latest log backup will also have the logs of previous log backup and by design selects the latest log backup for recovery.