We are able to observe the said problem while using the latest version of Aspose.Cells for .NET 8.3.1. The code name of the worksheet isn’t preserved after saving the spreadsheet with Aspose.Cells APIs. We have logged the problem in our bug tracking system under the ticket CELLSNET-43235 for further investigation & correction purposes. Please spare us little time to properly analyze the problem cause on our end. In the meanwhile, we will keep you posted with updates in this regard.
It is good to know that your issue is resolved with the latest version. Let us know if you encounter any other issue, we will be glad to look into it and help you further.