'Web Assembly :: Control <head> content in a Razor component (InvalidOperationException)

For a WASM project, I'm trying to have the CSS be downloaded when the site binaries change.

I'm trying to follow this post I found here: https://stackoverflow.com/a/71228054/18462839

, which basically adds:

<HeadContent>
<link href="css/app.css?@(Configuration["BuildNumber"])" rel="stylesheet" />

in App.razor, and this:

builder.RootComponents.Add<HeadOutlet>("head::after");

in Program.cs

It seems to work, but I get an Exception for Title and Head:

    crit: Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100]
      Unhandled exception rendering component: There is already a subscriber to the content 'title'.
System.InvalidOperationException: There is already a subscriber to the content 'title'.
   at Microsoft.AspNetCore.Components.Sections.SectionRegistry.Subscribe(String name, ISectionContentSubscriber subscriber)
   at Microsoft.AspNetCore.Components.Sections.SectionOutlet.Microsoft.AspNetCore.Components.IComponent.SetParametersAsync(ParameterView parameters)
   at Microsoft.AspNetCore.Components.Rendering.ComponentState.SupplyCombinedParameters(ParameterView directAndCascadingParameters)
crit: Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100]
      Unhandled exception rendering component: There is already a subscriber to the content 'head'.
System.InvalidOperationException: There is already a subscriber to the content 'head'.
   at Microsoft.AspNetCore.Components.Sections.SectionRegistry.Subscribe(String name, ISectionContentSubscriber subscriber)
   at Microsoft.AspNetCore.Components.Sections.SectionOutlet.Microsoft.AspNetCore.Components.IComponent.SetParametersAsync(ParameterView parameters)
   at Microsoft.AspNetCore.Components.Rendering.ComponentState.SupplyCombinedParameters(ParameterView directAndCascadingParameters)

Are there some code fragments I'm missing here?;)

blazor webassembly

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'Web Assembly :: Control <head> content in a Razor component (InvalidOperationException)

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