Hi Shiyao,
I have tested in the latest version the same channel of Excel; I can’t reproduce this issue at my end.
You can see my test result here, Russia displays normally on the Map even there is no data in the sheet. Given this situation, we suggest you go to Excel-> File-> Update Options-> Update Now to use the latest version of Semi-Annual Enterprise Channel and check the result.
Moreover, please create a new Excel workbook and check whether the issue persists. (Make sure you select the all range when creating Map chart.) If issue persists, please share the sample file here and we will try to check it at our end. (Please save the file in cloud drive and share the access link here.)
Appreciate your cooperation.
Best Regards,
Ivy