Defined custom Column format is not getting picked up for date types passed in data source

We have defined template in excel for one column to have custom format like ‘yyyymmdd’, we are passing datasource which has dates in it and we are expecting dates to be displayed in ‘yyyymmdd’ format. We are using latest Aspose library 20.3.0 in .Net Core 3.1 project.
Same code is working in .Net Framework from where we have referenced this code. Old code has library 18.2.0. Old code is working since last few years.
Could you help us with this as reports are not getting generated as per expectations.

@Umeshb,

Could you please try our latest version/fix: Aspose.Cells for .NET 22.1 if it makes any difference. If you still find the issue with latest version/fix, kindly share a sample VS.NET application (runnable), zip the project and post us with resource and sample files (input Excel file (if any) and output file). We will check your issue soon.

PS. please zip the Excel file(s) prior attaching.