Created Unassigned: ws.PageSetup.Footer.Right.AddText does not work , when read xlsx file. [9441]

```
XLWorkbook wb = new XLWorkbook(templateFullName);
IXLWorksheet ws = wb.Worksheet(1);
ws.PageSetup.Footer.Right.AddText("created:" + DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss"));

```
does not work.

```
XLWorkbook wb = new XLWorkbook();
IXLWorksheet ws = wb.Worksheets.Add("Sheet1");
ws.PageSetup.Footer.Right.AddText("created:" + DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss"));

```
works well.

Thank you.