SourceGenerator Intellisense

I'm currently trying to learn about source generators, and have implemented a very simple one.

[Generator]
public class KeysSourceGenerator : ISourceGenerator
{
    public void Execute(GeneratorExecutionContext context)
    {
        var code = """
        namespace MyLibrary;

        public partial class Keys
        {
            public static string Product1 = "1";
            public static string Product2 = "2";
            public static string Product3 = "3";
        }
        """;

        context.AddSource("GeneratedKeys.g.cs", code);
    }

    public void Initialize(GeneratorInitializationContext context)
    {

    }
}

where I can use the generated keys in another project like this :

 internal class Program
 {
     static void Main(string[] args)
     {
         string product1Key = MyLibrary.Keys.Product1;
         string product2Key = MyLibrary.Keys.Product2;
         string product3Key = MyLibrary.Keys.Product3;
     }
 }

However, the issue I am having, is that if I add a new key in the KeysSourceGenerator.Execute method e.g Product4 key, and then also use the new key in the linked project.

Whilst it builds and works. Intelli-sense still only shows the first 3 keys. I have to restart visual studio for it to pick up the new 4th key.

And this happens every time I want to add a new key. I have to restart VS.

Am I doing something wrong here?

I've copied the proj files below for reference

KeysGenerator (generator project)

<Project Sdk="Microsoft.NET.Sdk">

    <PropertyGroup>
        <TargetFramework>netstandard2.0</TargetFramework>
        <EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
        <LangVersion>latest</LangVersion>
    </PropertyGroup>

    <ItemGroup>
        <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.4">
            <PrivateAssets>all</PrivateAssets>
            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
        </PackageReference>
        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.7.0" />
    </ItemGroup>


</Project>

The project referencing KeysGenerator

<Project Sdk="Microsoft.NET.Sdk">

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

    <ItemGroup>
        <ProjectReference Include="..\KeysGenerator\KeysGenerator.csproj" OutputItemType="Analyzer"/>
    </ItemGroup>

</Project>