RC1 File/New MAUI Blazor Hybrid gets several MA002 warnings about UseMaui and SkipValidateMauiImplicitPackageReferences

[Eilon]

Repro:

1. Install VS 2023 Preview w/ .NET 8 RC1
2. Create new MAUI Blazor Hybrid project
3. Build it

Expected: No warnings

Actual: Got these warnings:

1>C:\Program Files\dotnet\packs\Microsoft.Maui.Sdk\8.0.0-rc.1.9171\Sdk\BundledVersions.targets(74,5): warning MA002: Starting with .NET 8, setting  <UseMaui>true</UseMaui>  does not automatically include NuGet package references in your project.  Update your project by including this item:  <PackageReference Include="Microsoft.Maui.Controls" Version="8.0.0-rc.1.9171" />.  You can skip this warning by setting  <SkipValidateMauiImplicitPackageReferences>true</SkipValidateMauiImplicitPackageReferences>  in your project file.
1>C:\Program Files\dotnet\packs\Microsoft.Maui.Sdk\8.0.0-rc.1.9171\Sdk\BundledVersions.targets(79,5): warning MA002: Starting with .NET 8, setting  <UseMaui>true</UseMaui>  does not automatically include NuGet package references in your project.  Update your project by including this item:  <PackageReference Include="Microsoft.AspNetCore.Components.WebView.Maui" Version="8.0.0-rc.1.9171" />.  You can skip this warning by setting  <SkipValidateMauiImplicitPackageReferences>true</SkipValidateMauiImplicitPackageReferences>  in your project file.
1>C:\Program Files\dotnet\packs\Microsoft.Maui.Sdk\8.0.0-rc.1.9171\Sdk\BundledVersions.targets(74,5): warning MA002: Starting with .NET 8, setting  <UseMaui>true</UseMaui>  does not automatically include NuGet package references in your project.  Update your project by including this item:  <PackageReference Include="Microsoft.Maui.Controls" Version="8.0.0-rc.1.9171" />.  You can skip this warning by setting  <SkipValidateMauiImplicitPackageReferences>true</SkipValidateMauiImplicitPackageReferences>  in your project file.
1>C:\Program Files\dotnet\packs\Microsoft.Maui.Sdk\8.0.0-rc.1.9171\Sdk\BundledVersions.targets(79,5): warning MA002: Starting with .NET 8, setting  <UseMaui>true</UseMaui>  does not automatically include NuGet package references in your project.  Update your project by including this item:  <PackageReference Include="Microsoft.AspNetCore.Components.WebView.Maui" Version="8.0.0-rc.1.9171" />.  You can skip this warning by setting  <SkipValidateMauiImplicitPackageReferences>true</SkipValidateMauiImplicitPackageReferences>  in your project file.
1>C:\Program Files\dotnet\packs\Microsoft.Maui.Sdk\8.0.0-rc.1.9171\Sdk\BundledVersions.targets(74,5): warning MA002: Starting with .NET 8, setting  <UseMaui>true</UseMaui>  does not automatically include NuGet package references in your project.  Update your project by including this item:  <PackageReference Include="Microsoft.Maui.Controls" Version="8.0.0-rc.1.9171" />.  You can skip this warning by setting  <SkipValidateMauiImplicitPackageReferences>true</SkipValidateMauiImplicitPackageReferences>  in your project file.
1>C:\Program Files\dotnet\packs\Microsoft.Maui.Sdk\8.0.0-rc.1.9171\Sdk\BundledVersions.targets(79,5): warning MA002: Starting with .NET 8, setting  <UseMaui>true</UseMaui>  does not automatically include NuGet package references in your project.  Update your project by including this item:  <PackageReference Include="Microsoft.AspNetCore.Components.WebView.Maui" Version="8.0.0-rc.1.9171" />.  You can skip this warning by setting  <SkipValidateMauiImplicitPackageReferences>true</SkipValidateMauiImplicitPackageReferences>  in your project file.
1>C:\Program Files\dotnet\packs\Microsoft.Maui.Sdk\8.0.0-rc.1.9171\Sdk\BundledVersions.targets(74,5): warning MA002: Starting with .NET 8, setting  <UseMaui>true</UseMaui>  does not automatically include NuGet package references in your project.  Update your project by including this item:  <PackageReference Include="Microsoft.Maui.Controls" Version="8.0.0-rc.1.9171" />.  You can skip this warning by setting  <SkipValidateMauiImplicitPackageReferences>true</SkipValidateMauiImplicitPackageReferences>  in your project file.
1>C:\Program Files\dotnet\packs\Microsoft.Maui.Sdk\8.0.0-rc.1.9171\Sdk\BundledVersions.targets(79,5): warning MA002: Starting with .NET 8, setting  <UseMaui>true</UseMaui>  does not automatically include NuGet package references in your project.  Update your project by including this item:  <PackageReference Include="Microsoft.AspNetCore.Components.WebView.Maui" Version="8.0.0-rc.1.9171" />.  You can skip this warning by setting  <SkipValidateMauiImplicitPackageReferences>true</SkipValidateMauiImplicitPackageReferences>  in your project file.

This does not happen with a non-Hybrid MAUI project.

See this MSBuild binlog for more details: MauiApp1_Debug_AnyCPU_Build_2023-09-21T16_11_34.6445119-07_00.binlog.zip

[Eilon]

I don't see any obvious reason why this would be different between the regular MAUI template and Blazor MAUI template... they seem quite similar in this regard.

[Eilon]

cc @mattleibow because this was introduced in #14770 a while ago. I think this has been happening since at least .NET 8 Preview 7.