Indeed we made changes in the Tabs component (related to this thread).
We didn't test for the case you describe in the video though as we haven't thought of such case where one would hide all tabs but the selected one. We will investigate how to support it with the new implementation.
As a workaround you can add the csproj file to the code generation ignore list and downgrade the Radzen.Blazor version to 2.15.11