This works differently in XlsIO and Excel:
=COUNTIF(B1:B4, "1, 2")
In Excel it counts the cell if it has exactly "1, 2".
In XlsIO it counts the cell if it has either "1" or " 2".
Tested with Syncfusion.XlsIO.Net.Core version 24.1.41
Anyone know why the difference in behavior?