CS0234 : The type or namespace name '...' does not exist in the namespace '__Blazor....'

[kefyru]

<Parent ItemsProvider="@_itemsProvider">
   <Child/>
</Parent>

where

[CascadingTypeParameter(nameof(T))]
public class Parent<T>: IComponent 
{
   [Parameter] 
   public IItemsProvider<T> ItemsProvider {get;set;}
}

public class Child<T>: IComponent {}

generated razor.g.cs:

public static void CreateParent_1_CaptureParameters<T>(
   global::MyApp.IItemsProvider<T> __arg0, 
   out global::MyApp.IItemsProvider<T> __arg0_out
) 
{
 __arg0_out = __arg0;
}

public static void CreateChild_2<T>(
   global::Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder, 
   int seq, 
   MyApp.IItemsProvider<T> __syntheticArg0 // problem here: seems like lacks 'global::'
)
{
        __builder.OpenComponent<global::MyApp.Child<T>>(seq);
        __builder.CloseComponent();
}

DotNet6.RC1

[TanayParikh]

Thanks for reporting, closing this out as duplicate of: #18757