I appear to have found a bug with the MergeNamedStyles function added recently. Please run the following top-level code (adjusting the file paths as needed) with the attached zipped workbooks as a .NET 9 C# console app
…...xlsx"); var inputSheet = targetWbk...new(@"C:\Swift\Templates\Dev\Input_STRUCTURE.xlsx"); targetWbk.MergeNamedStyles(srcWorkbook);...