Échec de la construction pour Asp.Net Core 3 (côté client Blazor)

J'ai commencé à développer une application Web avec ASP.NET Core 3 et le framework Blazor. Pendant quelques jours / semaines, j'ai pu construire mon application. Depuis l'annonce de l'aperçu 5, je n'ai pas pu construire mon application (avec la commande dotnet build ). J'ai l'erreur suivante:

<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
    <RestoreAdditionalProjectSources>
      https://dotnet.myget.org/F/aspnetcore-dev/api/v3/index.json;
      https://dotnet.myget.org/F/blazor-dev/api/v3/index.json;
    </RestoreAdditionalProjectSources>
    <LangVersion>7.3</LangVersion>
    <RazorLangVersion>3.0</RazorLangVersion>
    <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
    <OutputType>Exe</OutputType>
    <TargetFrameworks>netstandard2.0</TargetFrameworks>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.5.1" />
    <PackageReference Include="Microsoft.AspNetCore.Blazor" Version="3.0.0-preview5-19227-01" />
    <PackageReference Include="Microsoft.AspNetCore.Blazor.Build" Version="3.0.0-preview5-19227-01" PrivateAssets="all" />
    <PackageReference Include="Microsoft.AspNetCore.Blazor.DevServer" Version="3.0.0-preview5-19227-01" PrivateAssets="all" />
  </ItemGroup>
</Project>

Mon csproj ressemble à:

C:\Users\a\.nuget\packages\microsoft.aspnetcore.blazor.build\3.0.0-preview5-19227-01\targets\Blazor.MonoRuntime.targets(439,5): error MSB3073: The command "dotnet "" -l    
-o "D:\Repos\IdeaStudio.Website.Client\obj\Debug\netstandard2.0\linker/" 
-x "C:\Users\a\.nuget\packages\microsoft.aspnetcore.blazor.build\3.0.0-preview5-19227-01\targets\BuiltInBclLinkerDescriptor.xml" 
-x "D:\Repos\IdeaStudio.Website.Client\obj\Debug\netstandard2.0\linker.descriptor.xml" 
-a "C:\Users\a\.nuget\packages\microsoft.aspnetcore.blazor\3.0.0-preview5-19227-01\lib\netstandard2.0\Microsoft.AspNetCore.Blazor.dll" 
-a "C:\Users\a\.nuget\packages\microsoft.aspnetcore.components\3.0.0-preview5-19227-01\lib\netstandard2.0\Microsoft.AspNetCore.Components.dll" 
-a "C:\Users\a\.nuget\packages\microsoft.aspnetcore.components.browser\3.0.0-preview5-19227-01\lib\netstandard2.0\Microsoft.AspNetCore.Components.Browser.dll" 
-a "C:\Users\a\.nuget\packages\microsoft.extensions.dependencyinjection\3.0.0-preview5.19227.9\lib\netstandard2.0\Microsoft.Extensions.DependencyInjection.dll" 
-a "C:\Users\a\.nuget\packages\microsoft.extensions.dependencyinjection.abstractions\3.0.0-preview5.19227.9\lib\netstandard2.0\Microsoft.Extensions.DependencyInjection.Abstractions.dll" 
-a "C:\Users\a\.nuget\packages\microsoft.jsinterop\3.0.0-preview5.19227.9\lib\netstandard2.0\Microsoft.JSInterop.dll" 
-a "C:\Users\a\.nuget\packages\mono.webassembly.interop\3.0.0-preview5.19227.9\lib\netstandard2.0\Mono.WebAssembly.Interop.dll" 
-a "C:\Users\a\.nuget\packages\system.componentmodel.annotations\4.6.0-preview5.19224.8\lib\netstandard2.0\System.ComponentModel.Annotations.dll" 
-a "D:\Repos\IdeaStudio.Website.Client\obj\Debug\netstandard2.0\IdeaStudio.Website.Client.dll"" exited with code 1. 
[D:\Repos\IdeaStudio.Website.Client\IdeaStudio.Website.Client.csproj]

Je n'ai pas compris pour plusieurs jours avant ...