Unused PackageReference Not an Error

[chris-clark-serverless]

CSC : warning RT0003: PackageReference Serilog can be removed [C:\Users\ChrisClark{ProjectPath}.csproj]

I am using the latest version 3.

<?xml version="1.0" encoding="utf-8"?>
<Project>
  <ItemGroup>
    <PackageReference Include="ReferenceTrimmer" Version="3.3.11">
        <PrivateAssets>all</PrivateAssets>
        <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
    </PackageReference>
  </ItemGroup>
</Project>

I have added this to my editor config.

# unnecessary references
dotnet_diagnostic.RT0001.severity = error
dotnet_diagnostic.RT0002.severity = error
dotnet_diagnostic.RT0003.severity = error

dotnet build generates that first warning, but it is not a failed build.