SharePoint Security group "Name" property does not display

Hello Everyone,

I noticed the SharePoint Group "name" properties doesn't display any names and display totally blank. I updated the CU security update in April 2019 and it use to show correctly until last month. All sudden the names show blank. Any idea what is changed or how to display correctly the names under a sharepoint groups?

Please note that if I add singe user directly without adding a group, it displays correctly. The name property shows blank only when I add users in a group(also existing users shows blank under 'name')

Will you please help?

Thanks

Shridhar