We have a workbook with a macro sheet inside.
When we load the document into an Workbook and save it without any changes, the sheets get converted to a normal sheet and all formulas are gone.
We found this thread describing a similar problem in the JAVA version: Macro and Dialog Sheets are coerced to Worksheets.
Currently we have reproduced the problem in .NET 126.96.36.199.
Could it be the same problem and the .NET version does not contain this fix?