Markdown to Lexical Example does not work

[cgilly2fast]

Describe the Bug

Following document instructions on converting markdown to lexical does not work, follow you own example code exactly:

import {
  getEnabledNodes,
  sanitizeServerEditorConfig,
  defaultEditorConfig,
  $convertFromMarkdownString,
} from '@payloadcms/richtext-lexical'
import { createHeadlessEditor } from '@payloadcms/richtext-lexical/lexical/headless'
import configPromise from '@payload-config'

const config = await configPromise

  const sanitizedConfig = await sanitizeServerEditorConfig(defaultEditorConfig, config)

  const headlessEditor = createHeadlessEditor({
    nodes: getEnabledNodes({
      editorConfig: sanitizedConfig,
    }),
  })

const markdown = `# Hello World`

  headlessEditor.update(
    () => {
      $convertFromMarkdownString(markdown, sanitizedConfig.features.markdownTransformers)
    },
    { discrete: true },
  )

  const editorJSON = headlessEditor.getEditorState().toJSON()```

Issue is from $convertFromMarkdownString
Possibly line 54 from the source code:
https://github.com/payloadcms/payload/blob/main/packages/richtext-lexical/src/packages/%40lexical/markdown/MarkdownImport.ts

### Link to the code that reproduces this issue

https://see-below.com

### Reproduction Steps

See above

### Which area(s) are affected? (Select all that apply)

area: core

### Environment Info

```text
payload: 3.5.0
Next 15.0.4
"@payloadcms/richtext-lexical": "^3.5.0",
"lexical": "^0.20.0",

[github-actions]

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Useful Resources

• Reproduction Guide
• Contributing to Payload

[github-actions]

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