[[email protected]] top level custom markdoc tags are not rendered when rootHtml is null

[ayZagen]

Astro Info

Astro                    v5.1.5
Node                     v18.20.3
System                   Linux (x64)
Package Manager          unknown
Output                   static
Adapter                  none
Integrations             @astrojs/markdoc

If this issue only occurs in one browser, which browser is a problem?

No response

Describe the Bug

This issue happens after upgrading @astrojs/markdoc to 0.12.5.

When we set the rootHtml to null like in documentation custom markdoc tags are not rendered when encountered in top level.

//markdoc.config.js
import { defineMarkdocConfig, nodes, component } from '@astrojs/markdoc/config';
export default defineMarkdocConfig({
  nodes: {
    document: { ...nodes.document, render: null },
  },
  tags: {
    grid: {
      render: component('./src/components/Grid.astro'),
      attributes: {
        classes: { type: String },
      },
    },
  },
});

If you remove nodes.document setting or wrap the tag with another element it works. I have included both cases in reproduction.

Rendered output example:

What's the expected result?

It should render correctly. No problems with 0.12.4

Link to Minimal Reproducible Example

https://stackblitz.com/edit/github-kq641b?file=src%2Fcontent%2Fdocs%2Fintro.mdoc

Participation

• I am willing to submit a pull request for this issue.

[ayZagen]

I didn't notice at first but custom nodes are not rendered too.

For example:

 nodes: {
    document: {...nodes.document, render: null as any} ,
    heading: {
      ...nodes.heading,
      render: component('./src/components/content/CustomHeading.astro'),
    },
 }