Dotnet build hangs at CoreCompile when specific NuGet package referenced

[fabianoliver]

Describe the bug

When using SDK 9.0.100, building any project that references "ReactiveUI.SourceGenerations" version 1.1.31 hangs forever at the "CoreCompile" stage. Building the same project using SDK 8.0.100 works well.

Please feel free to close this issue if you reckon the package itself is at fault of course. I'm raising this here though as I would think that building this with a different SDK version "should" not be able to break the referenced package / source generator in any way?

To Reproduce

Build an empty project with the following csproj

<PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
</PropertyGroup>

<ItemGroup>
    <PackageReference Include="ReactiveUI.SourceGenerators" Version="1.1.31" PrivateAssets="all" />
</ItemGroup>