Virtualize test error with .NET 11 RC1 #1915

We are using bUnit in the Microsoft Fluent UI Blazor library. We are seeing testing errors with .NET 11 RC1 while testing our DataGrid that uses Virtualize.

This is the analysis from the Copilot Debugger:

Root cause is confirmed.

• The exception is not caused by your itemsProvider lambda or RefreshItems binding in FluentDataGrid_ItemsProvider.
• It is thrown inside bUnit’s Virtualize JS interop handler during render initialization.
  Evidence from the debugged sources:
• bUnit invokes OnSpacerBeforeVisible with 3 arguments:
  • VirtualizeJSRuntimeInvocationHandler.cs:44-45
  • object[] parameters = new object[3] { 0f, 0f, 1E+09f };
• In .NET 11, ASP.NET Core’s VirtualizeJsInterop.OnSpacerBeforeVisible expects 4 parameters:
  • VirtualizeJsInterop.cs:34
  • OnSpacerBeforeVisible(float spacerSize, float spacerSeparation, float containerSize, int reason)