Check the script carefully.
Does it do a shutdown abort followed by a startup and shutdown immediate?
A cold backup taken after that would be perfectly fine.

This sequence allows for a controlled timeline in scripted after-hours backups. If there was a pending transaction that was taking hours to complete, then an immediate shutdown would take hours to complete. By shutting down with abort option, and then doing a clean startup/shutdown sequence, the time it takes for the backup to complete would be predictable and controlled.

Could this be a possibility?

maachan