Hello,
I noticed that when grouping using a simple column, the data within the grid disappear and only appear again if I switch the grid page back and forth. I suspected virtualization is the issue and when enabling it using this samle: Blazor DataGrid Component - Grouping API | Free UI Components by Radzen, the issue appears.
Thank you.
I was able to reproduce the problem - the fix will be published with our next update Tomorrow.