Unable to parse json file in SourceGenerator - json

Question

I am attempting to read a json file and generate C# code. I have a source generator like below, and if I uncomment the JsonDocument line, the source generator stops working. In fact, if I use any class from System.Text.Json it stops working. I have also attempted to use Newtonsoft.Json same result.
Whilst building the target project that is using this source generator I get a build error error MSB6006: "csc.exe" exited with code -532462766.
using System;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Text;
using System.Text.Json;
namespace Raya.Plugin.Registrations.SourceGenerator
{
[Generator]
public class DeviceRegistrationGenerator : ISourceGenerator
{
public void Execute(GeneratorExecutionContext context)
{
var metadata = context.AdditionalFiles.Single(x => x.Path.EndsWith("plugin.metadata.json"));
// var doc = JsonDocument.Parse(metadata.GetText(context.CancellationToken).ToString());
}
public void Initialize(GeneratorInitializationContext context)
{
#if DEBUG
if (!Debugger.IsAttached)
{
Debugger.Launch();
}
#endif
Debug.WriteLine("Initalize code generator");
}
}
}
Generator csproj
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>netstandard2.0</TargetFramework>
<DevelopmentDependency>true</DevelopmentDependency>
<IncludeBuildOutput>false</IncludeBuildOutput>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
<LangVersion>latest</LangVersion>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
<LangVersion>latest</LangVersion>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.4.0" PrivateAssets="all" />
<PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.4.0" PrivateAssets="all" />
<PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.3" PrivateAssets="all" />
<PackageReference Include="System.Text.Json" Version="6.0.5" GeneratePathProperty="true" PrivateAssets="all"/>
</ItemGroup>
</Project>
UPDATE
Adding following seems to make it a work a bit, but I am not sure what is happening. Now I am getting InvalidCastException
<PropertyGroup>
<GetTargetPathDependsOn>$(GetTargetPathDependsOn);GetDependencyTargetPaths</GetTargetPathDependsOn>
<GeneratePackageOnBuild>True</GeneratePackageOnBuild>
</PropertyGroup>
<Target Name="GetDependencyTargetPaths" AfterTargets="ResolvePackageAssets">
<ItemGroup>
<TargetPathWithTargetPlatformMoniker Include="#(ResolvedCompileFileDefinitions)" IncludeRuntimeDependency="false" />
</ItemGroup>
</Target>
Exception
Since the project using this source generator also ends up referencing System.Text.Json.SourceGenerator.dll, I am getting following exception from that dll.
Unhandled Exception: System.InvalidCastException: [A]Microsoft.CodeAnalysis.CSharp.Syntax.CompilationUnitSyntax cannot be cast to [B]Microsoft.CodeAnalysis.CSharp.Syntax.CompilationUnitSyntax. Type A originates from 'Microsoft.CodeAnalysis.CSharp, Version=4.4.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Current\Bin\Roslyn\Microsoft.CodeAnalysis.CSharp.dll'. Type B originates from 'Microsoft.CodeAnalysis.CSharp, Version=4.4.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'LoadFrom' at location 'C:\Users\myuser.nuget\packages\microsoft.codeanalysis.csharp\4.4.0\lib\netstandard2.0\Microsoft.CodeAnalysis.CSharp.dll'