While using Stubble.Helpers, I've encountered an issue that helpers are not working when used in a partial. I've traced the issue down to the PartialTokenRenderer, in particular this line:

Because the pipeline settings of the parent context are not passed to Parse (i.e. it's missing , pipeline: context.RendererSettings.ParserPipeline), partials are always rendered with a default pipeline, even if their parent had pipeline modifications.

Workaround

As this library seems a bit dead in terms of PRs/updates, a workaround is to copy the PartialTokenRenderer, then "simply" replacing the built-in renderer:

var renderer = new StubbleBuilder()
    .Configure(builder =>
    {
        var tokenRenderers = builder.TokenRenderers;
        var idx = tokenRenderers.FindIndex(p => p.GetType().FullName == "Stubble.Core.Renderers.StringRenderer.TokenRenderers.PartialTokenRenderer");
        tokenRenderers.RemoveAt(idx);
        tokenRenderers.Insert(idx, new FixedPartialTokenRenderer());
    })
    .Build();

While not exactly pretty, it gets the job done, and allows partials to use the same render pipeline that was configured for the original renderer.