We can cancel the workflow using the below navigation:
Go to the system notes >active workflow >click on cancel.
Then a confirmation message shows on the Netsuite screen and clicks yes to proceed.
Once a workflow is canceled, the workflow field values will be null if we restart/retrigger the workflow again.
So this will result in issues.
Hence as a workaround set those values statically using a set field value action in the current state of the workflow and make sure that this is removed immediately after setting the values,or make sure that it is working only for the workflow canceled records.