Thanks for the sample code.
After an initial test, I am able to observe the issue as you mentioned. I found the output file (after using your sample code with your template file) is corrupted to certain extent. I open the output file into MS Excel (e.g 2007, 2013) manually and click on the sheet “p.46”. Now I use vertical scroll bar to navigate towards first two charts and suddenly it looks like MS Excel crashes which is not responding and I have to restart it.
Workbook workBook = new Workbook("e:\\test2\\before.xlsx");
workBook.BuiltInDocumentProperties.Author = "b";
workBook.BuiltInDocumentProperties.Company = "abc";
workBook.BuiltInDocumentProperties.LastSavedBy = "10-01-2018";
// save back to the original detected format, even if random file name(file upload)
I have logged a ticket with an id “CELLSNET-46236” for your issue. We will look into it soon.
Once we have an update on it, we will let you know here.