Codefix not loading from within VS, works in rider though

**Version Used**: VS 17.13.6

**Steps to Reproduce**:

1. Create project 
2. Save the script below next to the project folders, and run it
3. Open sln with VS + Rider

```pwsh
param(
[string]$Prefix="0.1.0",
[string]$Suffix="internal-$([DateTime]::Now.ToString('yyyyMMddHHmmss'))"
)

$projectName = "NupkgAnalyzerTest"
$tempDir = Join-Path $env:TEMP $(New-Guid) | %{ mkdir $_ }
try
{
Push-Location $tempDir
dotnet new sln -n "TestSolution"
dotnet new classlib -n "TestProject"
dotnet sln add TestProject
dotnet new nugetconfig
mkdir libs
dotnet nuget add source "./libs" --name "local.dir"

$nupkgProj = Resolve-Path "$PSScriptRoot\$projectName.Package\$projectName.Package.csproj"

dotnet restore $nupkgProj
dotnet build $nupkgProj -c Release
dotnet pack $nupkgProj -o "$tempDir/libs"

dotnet add TestProject package "$projectName" --prerelease
dotnet build "./TestSolution.sln"
explorer $tempDir
}
finally
{
Pop-Location
}
```

- Note that i am using a 100% raw template scaffold with zero changes. Any information on whether the template of VS is outdated, or the VS integration is having issues would be very welcome, because i want my analyzer codefix to work for both IDE's
- Also if i build a VSIX and manually install that i also get analyzer diagnostics, but no codefixes

**Diagnostic Id**:
no diagnostic

**Expected Behavior**:
Diagnostic codefix from nupkg works in both Rider+VS
**Actual Behavior**:
Only works fully in Rider - for VS the analyzer shows up but does not provide the codefix