When attempting to save an older .xls workbook there is a prompt "Copy to a new sheet"
Continue and Cancel is explained, but there is no explanation for "Copy to a new sheet".
If you select "Copy to a new sheet" the user expects their spreadsheet to be copied to a new sheet, but this is not what happens. Instead you unexpectedly get a "Compatibility Report".
The prompt logic at this point is convoluted. If you click "Save", you go in a circle (which makes no sense).
With "Don't Save" one would expect not to save the useless "Compatibility Report".
This is NOT what happens. You do not close the "Compatibility Report". You instead close the spreadsheet you were working on and all changes you made to it.